Chinese characters
Chinese characters () are logograms used to write the Chinese languages, as well as several other languages historically influenced by Chinese culture. Evolving in usage and style over the course of millennia, Chinese characters are the oldest continuously used writing system in the world.

The history of the system is characterised by waves of innovation and reform. Most recently, countries that write with Chinese characters have published standardised lists of characters, variant forms, and pronunciations. Broadly, simplified characters are used in mainland China, Singapore, and Malaysia, while traditional characters are used in Taiwan, Hong Kong, and Macau.

Historically, Chinese characters have been adapted to write other languages spoken by peoples of the Sinosphere, most prominently Japanese, Korean, and Vietnamese, where they are known as kanji, hanja, and chữ Hán respectively. The aforementioned three peoples also coined new characters for their own use, known as kokuji, gukja, and chữ Nôm respectively. Each of these languages belong to their own language families, and are generally very different from both Chinese and one another. Today, Korean and Vietnamese are almost exclusively written with alphabets later designed to replace Chinese characters, leaving Japanese as the only major non-Chinese language still written with Chinese characters.

Unlike in phonetic writing systems, where individual letters roughly correspond to phonemes, the Chinese writing system associates each logogram with a spoken syllable. Because Chinese languages are largely morphosyllabic, almost always corresponding individual syllables to morphemes, written characters largely also correspond one-to-one with morphemes. However, written Chinese is  ideographic—characters fundamentally correspond to spoken syllables, not to the abstracted ideas themselves.

To a higher degree than most major languages, modern spoken Chinese has many homophones: the same spoken syllable may have many meanings dictated by surrounding context, represented by one of many different characters. Additionally, a particular character may possess a range of distinct meanings, sometimes quite divergent ones, and different readings of the same character may have different pronunciations, even different etymologies. In Standard Chinese, one-fifth of the 2,400 most common characters have multiple possible pronunciations.

 Classification 

As reflections of human language, any rules or prescriptions regarding the nature of Chinese characters are imperfect models, and numerous such schemas have been presented by scholars.

 Traditional Shuowen Jiezi classification 
The traditional six-fold classification of Chinese characters () was first described by the scholar Xu Shen in the postface of his Shuowen Jiezi dictionary, .
While this analysis is occasionally problematic, arguably failing to fully capture the nature of the Chinese writing system, it has proven resilient and pervasive, and continues to serve as a model for those studying the language. Broadly, in order to create meaning  Chinese characters make use of sound, abstract idea, and graphical symbol together, such that each dimension mutually reinforces the others.

 Pictograms 

One of several strategies is used to assign characters to spoken words. A relatively small number of characters, Pictograms are representational pictures of physical objects. In practice, their forms are highly stylised and simplified from centuries of iteration: examples include  'sun',  'moon', and  'tree'. Xu Shen placed approximately 4% of all characters into this category.
Though few in number and limited in their scope, pictograms and ideograms form the basis on which more complex characters are derived. Over time, pictograms became increasingly stylised, simplified, and standardised, in order to make them easier to write.

If being used pictographically, the same component can ultimately be used to represent any number of distinct physical objects. As such, what a pictogram is depicting is often not immediately evident. For example, within a given character the radical  often carries a meaning related to mouths, but within  'tall'—a pictogram of a tall building—it instead depicts a window, ultimately lending to the character's meaning of 'tallness'. In another instance, the same 'mouth' radical depicts the lip of a vessel in the pictogram  'full'. These are examples of processes whereby pictograms can be extended from their original concrete meanings to take on additional layers of metaphor and synecdoche, which sometimes even displace the pictogram's original, literal meaning. Over time, this process sometimes creates excess ambiguity between graphically or phonetically similar characters, which is then usually resolved through adding additional components to disambiguate the characters in question. This can be done to create new pictograms, but usually instead results in characters that fall under the other categories in this classification.

 Simple ideograms 
Also called simple indicatives, this small category contains characters that are direct illustrations of abstract concepts. Examples include  'up' and  'down', originating as dots above and below a line respectively. Indicative characters are symbols for abstract concepts which could not be depicted literally but nonetheless can be expressed as a visual symbol: for example,  'convex',  'concave', and  'flat and level'.

 Compound ideographs 
Also translated as logical aggregates or associative idea characters, characters in this class are formed by combining two or more pictographs or ideographs to suggest a new, synthetic meaning. The canonical example is  'bright', often interpreted as the juxtaposition of the two brightest objects in the sky:  'sun', and  'moon', together expressing their shared quality of brightness. Though the historicity of this particular etymology has come into question with recent scholarship, it is definitively a canonical reading: for example, the term  has a meaning of 'understanding'. The addition of the abbreviated radical  on top results in the compound ideograph , alluding to the heliotropic behaviour of plant life. Other commonly cited examples include  (composed of pictographs  and ), and  (composed of  and ).

Xu Shen placed approximately 13% of characters in this category, but many of his examples are now believed to be phono-semantic compounds, whose origin has been obscured by subsequent changes in their form. Peter Boodberg and William Boltz go so far as to deny that any of the compound characters devised in ancient times were of this type, maintaining that now-lost "secondary readings" are responsible for the apparent absence of phonetic indicators, but their arguments have been rejected by other scholars.

In contrast, associative compound characters are common among kokuji, kanji originally coined in Japan. An example of a modern Chinese-language compound ideograph is  'platinum', combining the  and  radicals. (However, this character can also be interpreted as a phono-semantic compound akin to most chemical element names in Chinese, as discussed below.)

 Phonetic loans 

A pivotal step in the development of Chinese writing was the application of the rebus principle, or borrowing, in which an existing character was used to represent an unrelated word with similar or identical pronunciation.
The rebus device represented the stage at which logographic writing could acquire a deeper phonetic dimension. Chinese characters used purely for their sound values are attested in manuscripts from the Spring and Autumn and Warring States periods, with swapping back and forth between different characters to write the same word sometimes occurring within the span of a handful of lines; for example,  is used to write  and vice versa, and likewise with  for . These characters were either homophonous or nearly homophonous at the time of writing.

Sometimes the old meaning of a borrowed character was subsequently lost completely, as with characters such as , which has lost its original meaning of 'nose' completely, and now exclusively has the meaning of 'oneself', or , which originally meant 'scorpion' but is now used only to mean the number 'ten thousand'.

When transcribing words of foreign origin, such as with contemporary non-Chinese names, as well as with the Buddhist terminology borrowed in antiquity, Chinese characters are used for their phonetic value, in a rebus-like fashion. For example, in the name , each character is only used for its sound value, and does not provide any particular meaning. This usage is similar to that of Japanese katakana and hiragana, although these syllabaries use a special set of simplified forms derived from Chinese characters, in order to clarify their purely phonetic role. Use of the rebus principle has also been observed in the writing of names with both Egyptian hieroglyphs and Maya glyphs. However, the barrier between a character's pronunciation and meaning is never total: when transcribing into Chinese, phonetic characters are often chosen deliberately as to create certain connotations. This is regularly done with corporate brand names: for example, Coca-Cola's Chinese name is , with the phonetically matching characters selected as to also have a plausible translation as 'delicious and enjoyable'.

 Phono-semantic compounds 

Also known as semantic-phonetic compounds or picto-phonetic compounds, these characters are composed of at least two parts: the semantic component that suggests the general meaning of the compound, and the phonetic component that gives a hint as to the compound's pronunciation. Phono-semantic compounds are by far the largest class of characters within the traditional six-fold schema. In most cases, the semantic component is also the radical under which the character is categorised in dictionaries. Variously, the phonetic component of a compounds may be selected as to contribute an additional layer of meaning to the compound: as a result, determining whether a given character is a phono-semantic compound or a purely ideographic compound is often non-trivial.

Examples of phono-semantic compounds include , , , , and . All of these characters have  on the left, three short strokes which constitute a reduced form of the  radical, indicating that each character has some meaning related to "water". The right-hand side of each character is the phonetic indicator, with  having an identical Standard Chinese pronunciation to , and  pronounced similarly to . In the case of , the phonetic indicator is , which by itself means 'middle'. Baxter's reconstructions of Old Chinese provide the historical pronunciations as  and  respectively. In these cases the discrepancy is somewhat tame; however, the historical sound changes can have the effect of making the composition of characters seem totally arbitrary today.

In general, phonetic components do not provide the pronunciation of a character exactly, but only a clue as to its pronunciation. While some characters do take the exact pronunciation of their phonetic component, others may only share the initial or final sounds. In fact, some characters' pronunciations may not seem to correspond to the pronunciations of their phonetic parts at all, which is sometimes the case with characters that have undergone simplification. The 8 characters in the following table all take  for their phonetic part—however, it is apparent that none of them share 's modern pronunciation. The character's Old Chinese pronunciation has been reconstructed by Baxter–Sagart (2014) as . The table below shows some of the sound changes that have taken place since the Shang and Zhou dynasties, the time of most of these characters' original creation. The phonetic drift can be dramatic, sometimes to the point of no longer providing a modern reader any hint whatsoever as to the pronunciation.
 Phono-semantic compounds sharing phonetic component   Gloss Component    Modern     Mandarin  Cantonese  Japanese   colspan="2"           'pool'  ()'water'           'gallop' 'horse'   'loosen' 'bow'            'set up' 'flag'           'ground' 'earth'             ()'person'           'female' colspan="2"    'drag'  ()'hand'           

Xu Shen placed approximately 82% of characters into this category, while the figure from the 18th-century Kangxi Dictionary is closer to 90%, due to the extreme proficiency of this technique in extending the Chinese vocabulary. The chữ Nôm characters of Vietnam were also created using this principle.

This method is used to form new characters: for example  is the  radical plus the phonetic —described in Chinese as " gives sound,  gives meaning". Many Chinese names for chemical elements and other characters related to chemistry were formed in this way. In fact, it is possible to tell just by glancing at a Chinese periodic table which elements are metals (), solid non-metals (), liquids (), or gases () at standard temperature and pressure.

Occasionally, a disyllabic word is written with two characters that contain the same radical, as in , where both characters have the  radical. A notable example regards the pipa, a type of lute. Its name was originally shared with a fruit with a shape reminiscent of the instrument, known in English as the loquat. The name of the instrument was originally written with the  radical as ,  referring to the upward and downward strokes made when playing the instrument. The name for the fruit was later changed to  with the  radical, which has remained the name in use, while the name for the instrument became , with the added component . In other cases, characters within a compound word may share a radical coincidentally, without there being any particular meaning.

 Derivative cognates 
The smallest category of characters is also the least understood. In the postface to the , Xu Shen gave the example pair of  and , which have similar  pronunciations of  and  respectively, and may once have been the same word, meaning 'elderly person', and later lexicalising into two separate words. The term does not appear in the actual body of the dictionary, and is often omitted from modern systems.

 Contemporary classification 

The traditional Shuowen Jiezi schema presupposes either a phonetic or semantic purpose for every character component. More recently, using the lens of modern semiotics, many components have been identified as not functioning in either role: they have become pure signs, or "pure form" components. From this structural point of view, a seven-category system has been proposed by modern scholars:

Semantic characters made of only semantic components,
Phonetic characters made of only phonetic components,
Pure form characters made of only pure form components,
Semantic–phonetic characters—also called "phono-semantic characters"—made of both semantic and phonetic components,
Semantic–form characters made of semantic and pure form components,
Phonetic–form characters made of phonetic and pure form components, and
Semantic–phonetic–form characters with all three component types.

According to Yang, of the 3,500 frequently used characters in contemporary Standard Chinese, semantic characters are the rarest, accounting for about 5% of the lexicon, followed by pure form characters with 18%, and semantic–form and phonetic–form together accounting for 19%, with the remaining 58% being semantic–phonetic characters—loosely analogous to the traditional category of phono-semantic compounds.

 Words 

In Chinese, there is a distinction between characters and words. In modern Chinese varieties, most words are compounds written with two or more characters. Written Chinese first emerged during the stage of the spoken language's development known as Old Chinese.
In most cases, each Chinese character corresponds to a morpheme that was originally an independent word in Old Chinese. As a result, characters that are cognate among modern Chinese varieties—which have each descended from Old Chinese—are generally written with the same character. Different readings of the same character are often related in both sound and meaning.

Classical Chinese is an ancient form of the written language whose use was loosely analogous to that of Latin in pre-modern Europe; it remained the prestige written language of China until the 20th century, well after the spoken varieties descended from Old Chinese had diverged. Despite being an artificial literary form, it retained many properties of spoken Old Chinese. Over time, with numerous sound mergers occurring throughout different varieties, the introduction of polysyllabic words increasingly served the function of reducing ambiguity between words that had since become homophonic. Today, it has been estimated that over two-thirds of the 3,000 most common words in modern Standard Chinese are polysyllables, with the vast majority of these being two-syllable words.

 Old Chinese 
right|upright=0.7|thumb|Excerpt from a 1436 primer on Chinese characters

Words in Old Chinese were generally monosyllabic; as such, each character denoted an independent word. Affixes could be added to form a new word, which was often written with the same single character. In many cases, the pronunciations then diverged due to the systematic sound changes caused by the affixes. For example, many additional readings in modern varieties reflect the Middle Chinese 'departing tone', the major source of the 4th tone in modern Standard Chinese. Many scholars now believe that this Middle Chinese tone is the reflex of an Old Chinese derivational suffix  called the qusheng that served a range of semantic functions—possibly the only example of inflectional morphology extant in the otherwise analytic language. For example:
 Character          Gloss    >   >  'to transmit'   >   >  'a record'    >   >  'to grind'   >   >  'grindstone'    >   >  'to stay overnight'   >   >  'celestial mansion'    >   >  'speak'   >   >  'exhort'

Another common sound change occurred between voiced and voiceless initials, though the phonemic voicing distinction has disappeared in most modern varieties. This is believed to reflect an Old Chinese de-transitivising prefix, but scholars disagree on whether the voiced or voiceless form reflects the original root. Note how the pairs of readings below reflect opposite transitivity from one another.

 Character          Gloss    >   >  'to see'   >   >  'to appear'    >   >  'to defeat'   >   > 'to be defeated'    >   >  'to bend'   >   >  'to be broken by bending'

 Vernacular Chinese 

Multi-syllable words began entering the language during the Western Zhou period; it is estimated that between 25% and 30% of the vocabulary used in Warring States period texts is polysyllabic. The process has accelerated over the centuries as phonetic change has increased the number of homophones. The most common process of Chinese word formation after the Classical period has been to create compounds of existing words. Words have also been created by appending affixes to words, by reduplicating words, and by borrowing words from other languages. While polysyllabic words are generally written with one character per syllable, abbreviations are occasionally used.

Many compound words are composed from two near-synonymous characters words, creating a new, less ambiguous form that is often used in variation with one of its component characters, depending on context. For example:
 Initial   Final   Compound  +  → 
Equally as common are nouns composed from a root and a particle suffix possessing no particular meaning, such as . These constructions serve to create a disyllabic word with the same meaning as the root character. As above, the root word usually, though not always, remains independent, in variation with the compound word.
 Initial   Final   Compound  +  → 
Morphemic characters that have fallen out of use as independent words, and are now used only in compounds, are called bound forms.
 Initial   Final   Compound - +  → 

Large-scale surveys by the PRC's Ministry of Education and State Language Commission have shown strong distribution patterns in the use of characters and words. This form of analysis is essential to the quantitative research of the Chinese language, with applications in pedagogy, publishing, and information processing.

The number of characters used in modern Chinese is stable, hovering around 10,000 in recent decades. Contrastingly, 80% of Chinese-language text is composed of just 590 characters, with 90% coverage achieved with 960 characters, and 99% with 2,400.

 History 
thumb|Comparative evolution from pictograms to abstract shapes in cuneiform, Egyptian hieroglyphs, and Chinese characters
According to Qiu Xigui, the broadest trend in the evolution of Chinese characters over their history has been simplification, both in graphical shape (), the "external appearances of individual graphs", and in graphical form (), "overall changes in the distinguishing features of graphic[al] shape and calligraphic style, [...] in most cases refer[ring] to rather obvious and rather substantial changes".

 Legendary origins 
Several works of classical Chinese literature indicate that, prior to the invention of characters, knotted cords were used to keep records. The practice had some similarities to the Inca technique of quipu. Works that reference the practice include chapter 80 of the Tao Te Ching "Let the people again knot cords and use them (in place of writing)" – Explanatory parenthetical added by the translator. and the "Xici II" chapter within the Yijing.

According to tradition, Chinese characters were invented by Cangjie, a figure said to have been a scribe to the legendary Yellow Emperor during the . Frustrated by the limitations of knotting, and inspired by his study of the animals of the world, the landscape of the earth, and the stars in the sky, Cangjie is said to have invented symbols called —the first Chinese characters. The legend relates that on the day the characters were created, grain rained down from the sky and that night the people heard ghosts wailing and demons crying because the human beings could no longer be cheated.

 Neolithic 

In recent decades, a series of inscribed graphs and pictures have been found at Neolithic sites in China, including Jiahu (), Dadiwan and Damaidi from the , and Banpo ().  Often these finds are accompanied by media reports that push back the purported beginnings of Chinese writing by thousands of years.;  However, because these marks occur singly without any implied context and are made crudely, Qiu Xigui concludes that "we do not have any basis for stating that these constituted writing nor is there reason to conclude that they were ancestral to Shang dynasty Chinese characters." However, they do demonstrate a history of sign use in the Yellow River valley from the Neolithic through to the Shang period.

 Oracle bone script 

right|thumb|upright|Ox scapula with oracle bone inscription
The earliest confirmed evidence of Chinese script is the body of inscriptions carved on bronze vessels and oracle bones from the late Shang dynasty (). The earliest of these is dated to . In 1899, pieces of these bones were being sold as "dragon bones" for medicinal purposes, when scholars identified the symbols on them as Chinese writing. By 1928, the source of the bones had been traced to a village near Anyang in Henan, which was excavated by the Academia Sinica between 1928 and 1937. Over 150,000 fragments have been found.

Oracle bone inscriptions are records of divinations performed in communication with royal ancestral spirits. The inscriptions range in length from a few characters at the shortest, to 30–40 characters at the longest. The Shang king would communicate with his ancestors by means of scapulimancy, inquiring about subjects such as the royal family, military success, and weather forecasting. The interpreted answers would be recorded on the divination material itself.

Oracle bone script is a well-developed writing system, suggesting that the Chinese script's origins may lie earlier than the late .  Although these divinatory inscriptions are the earliest surviving evidence of ancient Chinese writing, it is widely believed that writing was used for many other non-official purposes, but that the materials upon which non-divinatory writing was done—likely on wood and bamboo—were less durable than bones and shells, and have since decayed away.

 Zhou scripts 
thumb|left|The Zhou-era Shi Qiang pan, a bronze ritual basin dated . Long inscriptions on the surface describe the deeds and virtues of the first seven Zhou kings

The traditional notion of an orderly procession of scripts, with each suddenly invented and displacing the one previous, has been conclusively superseded by modern archaeological finds and scholarly research. More often, it was the case that two or more scripts coexisted in a given area, and that scripts evolved gradually. As early as the Shang dynasty, oracle bone script coexisted as a simplified form alongside the normal script in bamboo books—preserved in bronze inscriptions—as well as the elaborate pictorial forms, often clan emblems, found on many bronzes.

Based on studies of these bronze inscriptions, it is clear that the mainstream script evolved in a slow, unbroken fashion from the Shang to the Zhou dynasty, until assuming the form that is now known as small seal script in the state of Qin, without any sudden shifts.Chén Zhāoróng 2003. Meanwhile, other scripts had evolved during the late Zhou, especially in eastern and southern regions. These include decorative scripts such as the bird-worm seal script, and the regional 'ancient' forms of eastern warring states, preserved as variant forms in the Han-era Shuowen Jiezi.

 Qin unification and small seal script 

Small seal script, which had evolved slowly in the state of Qin during the Eastern Zhou, became standardised as the character forms used throughout all of China by the imperial Qin dynasty. However, more than one script was in use at the time: a little-known, rectilinear, 'vulgar' form of the characters had coexisted alongside the more formal seal script for centuries in the Qin state; the popularity of this vulgar form grew as the practice of writing itself became more widespread. An immature form of clerical script called "early clerical" or "proto-clerical" had already developed by the Warring States period in the state of Qin based upon this vulgar form, with influence from seal script as well. The coexistence of the three scripts—small seal, vulgar and proto-clerical, with the latter evolving gradually into clerical script—runs counter to the traditional belief that the Qin dynasty only used one script, and that the clerical script was suddenly invented during the early Han.

 Han dynasty 
 Clerical and clerical cursive 

The proto-clerical script matured gradually, and by the early Han period its sophistication was comparable to small seal script. Recently discovered bamboo slips show the emergence of mature clerical script by the end of Emperor Wu of Han's reign in .

Like previous eras, there were multiple scripts in use during the Han, although mature clerical script, also called  script, was dominant. An early type of cursive script was also in use by the Han at least as early as 24 BCE; it incorporated popular cursive forms of the time, as well as elements from the vulgar writing of Qin. By the time of the Jin dynasty, this Han cursive became known as , known sometimes in English as 'clerical cursive', 'ancient cursive', or 'draft cursive'. Some believe the name, using the character , arose because the style was a more orderly form of cursive than the modern form, called , which emerged during the Jin and is still in use today,

 Neo-clerical 
Around the middle of the Eastern Han, a simplified and easier form of clerical script appeared, which Qiu terms . This had become the dominant daily script by the late Han,  although clerical script remained in use for formal works such as engraved stelae. Qiu describes this neo-clerical script as a transitional form between clerical and regular script, and it remained in use through the Cao Wei and Jin dynasties.

 Semi-cursive 
By the late Han, an early form of semi-cursive script had begun developing from a cursive form of neo-clerical script. This semi-cursive script was traditionally attributed to Liu Desheng (188 CE), although such attributions refer to early masters of a script rather than to their actual inventors, since the scripts generally evolved into being over time. Qiu gives examples of early semi-cursive script, showing that it had popular origins rather than being solely Liu's invention.

 Wei to Jin 
 Regular script 

thumb|A page from a printed Song publication in a regular script typeface, which resembles the handwriting of Tang-era calligrapher Ouyang Xun
The design of regular script has been credited to Cao Wei calligrapher Zhong Yao (230), often called the "father of regular script". However, some scholarsTranscript of lecture 《楷法無欺》 by 田英章. Retrieved 2010-05-22. observe that one person could not have unilaterally developed a new script which went on to see universally adoption, but could only have been a crucial contributor to the style's gradual formation. The earliest surviving manuscripts written in regular script are copies of Zhong Yao's work, including at least one copied by Wang Xizhi, often called the "Sage of Calligraphy". Regular script developed out of a neatly written form of early semi-cursive, with the addition of a  technique to end horizontal strokes, plus heavy tails on strokes which are written the downward-right diagonal. Thus, early regular script emerged from a neat, formal form of semi-cursive, which had itself emerged from neo-clerical, a simplified, convenient form of clerical script. It matured further during the Eastern Jin in the hands of Wang Xizhi and his son Wang Xianzhi. However, it had not yet achieved widespread use, with most writers continuing to use the earlier neo-clerical and semi-cursive styles for daily writing, with the conservative clerical script also remaining in use on some stelae.

 Modern cursive 
Meanwhile, modern cursive script slowly emerged during this period, under the influence of both semi-cursive and the newly emerged regular script. In the hands of a few master calligraphers such as Wang, modern cursive began to be formalised.

 Maturation of regular script 
It was not until the Northern and Southern dynasties that regular script rose to dominant status. During that period, regular script continued evolving stylistically, reaching full maturity in the early Tang dynasty. Some call the writing of Ouyang Xun the first examples of mature regular script. After this point, although developments in the art of calligraphy and in character simplification still lay ahead, there were no more major stages of evolution for the mainstream script.

 Computer encoding 

Han unification is an ongoing effort by the Unicode Consortium to map each of the multiple character sets used within Chinese, Japanese, and Korean—together called the 'CJK languages'—into a single set of unified characters equally usable each language. The first release of the Unicode standard in 1991 was a major milestone of Han unification, and most text on the internet written in the relevant languages is now encoded with so-called CJK ideographs.

 Structure 

Broadly, Chinese characters are normally rectilinear units of uniform width. Within the square allotted to each character, most are constructed from smaller components, which are in turn drawn with a series of strokes. Strokes can be considered both the basic unit of handwriting, as well as the basic unit of graphemic organisation within the system. Individual strokes are generally categorised according to technique and graphemic function, as exemplified by the Eight Principles of Yong.

Both the order in which strokes are drawn within a given component, as well as the order that components are assembled into whole characters is largely fixed, lending predictability and order to the writing system as a whole. This is broadly summed up in practice with a few rules of thumb: generally, components and characters are assembled from left-to-right, and from top-to-bottom, with 'enclosing' components being drawn after the components they enclose.

For example,  (meaning 'character') is made up of two components, each in turn composed of three strokes, which are drawn in the following order:

 Character  Component  Stroke 80px  (1)   (2)   (3)   (4)  (5)  (6)  500px

Over a character's history, graphical variants with identical meanings called allographs emerge via several processes, possibly to facilitate ease of handwriting, or to create a more 'correct' composition to the writer, according to the principles generally used to compose and explain characters. For example, individual components may be replaced with visually-, phonetically-, or semantically similar alternatives. For certain characters and components, different regions may traditionally have different normative stroke orders, or even different variants entirely.

The boundary between character structure and style, and thus between allographs of the same character versus semantically distinct characters, is often non-trivial or unclear.

 Script styles 

thumb|left|Cursive script by Tang calligrapher Sun Guoting |upright=0.75

There are numerous styles, or  in which Chinese characters can be written, usually drawing from a specific historical or typographic tradition. Most originated within China, but are commonly seen throughout the Sinosphere, with minor regional variation. Script styles created outside China include the Japanese Edomoji and the Vietnamese  script, though these have tended to remain localised in their use.

The oldest script style commonly used today is Qin-era seal script, though usually limited to use in the seals that lend the style its modern name. Though the art of carving traditional seals remains alive, few people are still able to comfortably read them today. Clerical and regular script styles are still ubiquitous in print; when writing by hand, semi-cursive styles are also widely used. Modern use of fully cursive script is largely informal—basic character shapes are suggested rather than explicitly realised, and abbreviation is sometimes extreme. Despite being cursive to the point where individual strokes are no longer differentiable and characters are often illegible to the untrained eye, cursive writing has historically been highly revered for the beauty and freedom that it is seen to embody. Some standard simplified forms are derived from cursive, as well as the Japanese hiragana syllabary.

 Calligraphy 

thumb|right|Chinese calligraphy of mixed styles by Song poet Mi Fu

Chinese calligraphy is usually done with ink brush, and was considered one of the four arts to be mastered by Chinese scholars. The set of rules is deliberately minimalist, but each character has a set number of brushstrokes. Strict regularity is not required, since strokes may be accentuated for dramatic effect of individual style. Calligraphy was considered a means by which scholars could artfully express their thoughts and teachings.

 Typography and design 
thumb|left|upright=0.75|The first four characters of Thousand Character Classic in different typefaces and historical styles. From right to left: seal script, clerical script, regular script, Ming, and sans-serif

'Song' typefaces ()—also called 'Ming', especially in Japan, Taiwan, and Hong Kong—are named for the respective imperial dynasties whose printed styles are being imitated, considered to be periods during which woodblock printing flourished in China. Ming and sans-serif are the most popular in body text.

Sans-serif typefaces, called  in Chinese and 'Gothic' () in Japanese, are characterised by simple lines of even thickness for each stroke, akin to sans-serif styles in Western typography.

Typefaces that emulate regular script are also common, but not as common as Ming or sans-serif typefaces in body text. Most typefaces in the Song dynasty were regular script typefaces, which resembled a particular calligrapher's handwriting, while most modern regular script typefaces tend toward general-purpose use. Regular script typefaces are often used to teach students characters, often aiming to match the standard forms within the region where they are used.

 In non-Chinese languages 
thumb|upright=0.85|420px|

The Korean, Japanese and Vietnamese languages have historically been written with Chinese characters, used for record-keeping, histories, and official communications."...East Asia had been among the first regions of the world to produce written records of the past. Well into modern times Chinese script, the common script across East Asia, served—with local adaptations and variations—as the normative medium of record-keeping and written historical narrative, as well as official communication. This was true, not only in China itself, but in Korea, Japan, and Vietnam." The Oxford History of Historical Writing. Volume 3. Jose Rabasa, Masayuki Sato, Edoardo Tortarolo, Daniel Woolf – 1400–1800, p. 2.In these languages, Chinese characters have often been used to represent Chinese loanwords. Some characters retained their phonetic elements based on their pronunciation in a historical variety of Chinese from which they were acquired. These adaptations of Chinese pronunciation are known as Sino-Xenic pronunciations, and have been useful in the linguistic reconstruction of Middle Chinese.

Chinese characters were used in Vietnam during the millennium of Chinese rule that began in 111 BCE; they were originally used for writing Classical Chinese, but were adapted around the 13th century to write the Vietnamese language, creating the chữ Nôm script.

Chinese characters arrived in Korea beginning in the 2nd century BCE, alongside influences such as Buddhism; over the following three centuries, their use became widespread. From Korea, the characters spread to Japan language during the 5th century CE.

Currently, the only non-Chinese language normally written with Chinese characters is Japanese. Vietnam abandoned the use of  and Classical Chinese in the early 20th century in favour of a Latin alphabet, and Korea has largely replaced the use of hanja with hangul. Since education regarding Chinese characters is not mandatory in South Korea, the usage of hanja is rapidly disappearing.

 Japanese 

In the Japanese writing system, Chinese characters used are known as kanji. Japanese historically borrowed many words from Chinese, which were written with their original characters, while native Japanese words were also written with orthographic borrowings of Chinese characters with similar meanings. Most kanji arrived via both borrowing processes, and thus have both native Japanese readings, known as kun'yomi, as well as Chinese-original readings, known as on'yomi. Moreover, Chinese words were often borrowed multiple times from different varieties and at different times, resulting in several distinct on'yomi readings for the same character. Modern Japanese uses kanji for most word stems, as well as hiragana and katakana, a pair of syllabaries collectively known as kana. Hiragana are used to write words, including Japanese's grammatical inflections and particles, and katakana are used for transcribing non-Chinese loanwords, as well as for emphasis of native words, similar to how italics are used in languages written with the Latin script. The syllabaries were derived by simplifying Chinese characters selected to represent Japanese syllables; they differ from one another in part because each selected different characters for certain syllables, in addition to the different strategies employed to reduce the characters for easy writing. The angular katakana were obtained by selecting a smaller component from each character, while the curving hiragana were based on the cursive form of the entire character.

Because Japanese, unlike Chinese, is a synthetic language, many words consist of multiple syllables, and as such many kanji have multi-syllable pronunciations. For example, the kanji  has a native kun'yomi reading of . In different contexts, it can also be read with the on'yomi reading , such as in the Chinese loanword , whose pronunciation descends from the Chinese pronunciation at the time of borrowing. (In contemporary Standard Chinese, the word is pronounced .) While modern loanwords from languages outside of the Sinosphere are usually written with katakana, loanwords prior to the Meiji era were typically written with unrelated kanji whose on'yomi had the same pronunciation as the syllables in the loanword. These spellings are called called ateji: for example,  was written for modern ,  or  for modern , and  or  for modern . Only some ateji spellings are still in common use, such as .

 Korean 

As early as the Gojoseon period, Classical Chinese was the dominant form of written communication in Korea. Although the hangul alphabet was invented by the Joseon king Sejong in 1443, it was not taken up by Korean literati, and did not come into widespread use until the late 19th century. Even today, much of the Korean vocabulary, especially in areas of science and sociology, comes directly from Chinese. However, due to the lack of tones in the Korean language, many dissimilar Sino-Korean words took on identical pronunciations, and as such are spelled identically in hangul.  For example, the phonetic dictionary entry for  yields more than 30 different entries. In the past, this ambiguity had been efficiently resolved by parenthetically displaying the associated hanja. While hanja is sometimes used for Sino-Korean vocabulary, native Korean words are rarely, if ever, written in hanja.

When learning to write hanja, students are taught to memorise both native and Sino-Korean Korean pronunciations for each hanja. The collation of hanja is similar to if the word water were listed as 'water; aqua', 'horse; equus', or 'gold; aurum', as hybridisations of the English and Latin terms. Examples of listings include:
 Hanja Hangul Gloss Native  Sino-Korean       'water'       'person'       'big'       'small'       'down'       'father'       'Korea'

 South Korea 
Hanja are still used in South Korea, particularly in newspapers, weddings, place names, and the practice of calligraphy—although to nowhere near the extent of kanji use in Japanese society. Contemperaneously, Chinese characters are sometimes used for disambiguation of homophones. Additionally, their use still possesses connotations of learnedness and cultural Confucianism; knowledge of Chinese characters is considered to be a high class attribute by many Koreans, and an indispensable part of a classical education.
There is a clear trend toward the exclusive use of hangul in ordinary South Korean contexts. Its use has become a politically contentious issue in the country, with some urging a "purification" of the national language and culture by totally abandoning their use and ending hanja education in schools, and instead exclusively using hangul throughout society and the in public schools. Others support a revival of ordinary hanja use, such as was the case in the 1970s and 80s.

Hanja educational policy has swung back and forth within the country, often swayed by the inclinations of individual education ministers. Students in grades 7–12 are presently taught 1,800 characters, albeit with a principal focus on simple recognition, with the aim of achieving newspaper literacy. Hanja retains its prominence in Korean academia, as the vast majority of Korean documents, history, and literature (such as the Veritable Records of the Joseon Dynasty) were written in Classical Chinese using hanja. Therefore, a working knowledge of Chinese characters is still important for anyone wishing to interpret and study older Korean texts, or anyone who wishes to read scholarship in the humanities. Working knowledge of hanja is also useful for understanding the etymology of Sino-Korean vocabulary.

 North Korea 
In North Korea, the hanja system was completely banned since June 1949 as part of a ban on all so-called foreign languages, including even the then-newly proposed New Korean Orthography. The ban continued into the 21st century. However, a textbook for university history departments containing 3,323 distinct characters was published in 1971.  In the 1990s, school children were still expected to learn 2,000 characters, more than in South Korea or Japan.

Upon the accession of Kim Jong Un in 2011, the North Korean government began mandating the use of hanja as a source of definition for the Korean language. Currently, North Korea is estimated to teach around 3,000 hanja to North Korean students; in some cases, the characters appear within advertisements and newspapers. However, it is also said that the authorities implore students not to use the characters in public. Due to the country's isolation, accurate reports about hanja use in North Korea are hard to obtain.

 Okinawan 

Chinese characters are thought to have been first introduced to the Ryukyu Islands in 1265 by a Japanese Buddhist monk. After the Okinawan kingdoms became tributaries of Ming China, especially the Ryukyu Kingdom, Classical Chinese was used in court documents, but hiragana was mostly used for popular writing and poetry. After Ryukyu became a vassal of Japan's Satsuma Domain, Chinese characters became more popular, as well as the use of Kanbun. In modern Okinawan, which is labelled as a dialect of Japanese by the Japanese government, katakana and hiragana are mostly used to write Okinawan, but Chinese characters are still used.

 Vietnamese 
thumb|right|upright=1.1|The first two lines of the classic Vietnamese epic poem The Tale of Kiều, written in both chữ Nôm and the Vietnamese alphabet

Until the early 20th century, Classical Chinese () was used in Vietnam for all official and scholarly writing. Chinese characters, called chữ Hán (), chữ Nho (), or Hán tự (), are now limited to ceremonial use in Vietnam. 

The oldest written Chinese text found in Vietnam is an epigraphy dated to the year 618, erected by local Sui officials in Thanh Hóa. Around the 13th century, a script called   () was developed to record folk literature in the Vietnamese language. Similar to Zhuang sawndip, some chữ Nôm characters were created by combining semantic character components with phonetic components that resembled Vietnamese syllables. This process resulted in a highly complex system whose use was limited to a small portion of the Vietnamese population, never more than 5%. The oldest chữ Nôm written alongside Chinese is a Buddhist inscription, dated 1209. Before 1945, the library of the French School of the Far East (EFEO) in Hanoi collected a total of around 20,000 Chinese and Vietnamese epigraphy rubbings from throughout Indochina. The oldest surviving extant manuscript in Vietnam is a late 15th-century bilingual copy of the Buddhist Sutra of Filial Piety, currently kept by the EFEO. It features Chinese text in larger characters, and an Old Vietnamese translation in smaller characters glossing the text. Every  book in Vietnam after the  is dated between the 17th and the 20th centuries, with most being hand-copied works, and few printed texts. By 1987, the library of the Institute of Hán-Nôm Studies in Hanoi had collected a total of 4,808  manuscripts.
thumb|left|upright=0.9|A page from a bilingual copy of the Sutra of Filial Piety, with Classical Chinese alongside an early form of , representing the Old Vietnamese pronunciation. Sometimes, pairs of characters are used to represent the consonant clusters present in Old Vietnamese
Classical Chinese and  fell out of use during the French colonial period, and were gradually replaced with the Vietnamese alphabet, which uses Latin characters and remains the primary writing system for Vietnamese. Chinese characters and chữ Nôm are still used in some activities connected with Vietnamese traditional culture, such as calligraphy.
thumb|upright=0.7|Vietnamese imperial edict in Classical Chinese

 Other languages 
Several minority languages of South and Southwest China were formerly written with scripts based on Chinese characters, but also included many locally created characters. The most extensive is the sawndip script used to write the Zhuang languages of Guangxi, which is still in use despite efforts to encourage the writing of Zhuang with a Latin-based alphabet. Other languages written with such scripts include Miao, Yao, Bouyei, Mulam, Kam, Bai, and Hani. All these languages are now officially written using Latin-based scripts, while Chinese characters are still used for the Mulam language. Even today for Zhuang, according to survey, the traditional sawndip script has twice as many users as the official Latin script.

The foreign dynasties that ruled northern China between the 10th and 13th centuries developed scripts that were inspired by Chinese characters but did not use them directly: the Khitan large script, Khitan small script, Tangut script, and Jurchen script—though Chinese characters were used to phonetically transcribe the language of the Jurchen people, both renamed 'Manchu' after the founding of the Qing dynasty. Other scripts within China that have adapted a few Chinese characters but are otherwise distinct include the Geba script, Sui script, Yi script, and the Lisu syllabary.

 Transcription 

thumb|right|upright=0.9|Excerpt from the Secret History of the Mongols featuring Chinese characters used to write Mongolian, with glosses to the right of each row
Along with the Persian and Arabic scripts, the Mongolian language was also written with Chinese characters phonetically transcribing Mongolian sounds. Notably, the only surviving copies of The Secret History of the Mongols were written in such a manner.

According to the 19th century missionary John Gulick:

 Standard forms 

In each region, the latest standards for character forms are:
 Polity  Standard    Characters  Latest revision   Table of General Standard Chinese Characters    2013   List of Graphemes of Commonly-Used Chinese Characters    2012   Chart of Standard Forms of Common National Characters    1979 Chart of Standard Forms of Less-Than-Common National Characters    1998 Chart of Rarely-Used National Characters    2017   Jōyō kanji    2010   Han-Han Dae Sajeon  

In addition to strictness in character size and shape, Chinese characters are written with very precise rules. The most important rules regard the strokes employed, as well as their placement and order. Just as each region using Chinese characters has standardised forms, each also has standardised stroke orders. Most characters have just one standard stroke order, though some words may differ in stroke order by region, even occasionally resulting in different stroke counts.

There is often considerable overlap between the concepts of 'style' and 'form'; with the advent of Unicode, this distinction has challenged the process of Han unification. The designers of the Noto CJK family of typefaces, a collaboration between Google and Adobe, researched the regional distinctions in Chinese character forms extensively, as to create a general-purpose, neutral typeface family—and not release fonts meant to write Japanese that looked "too Chinese", or vice-versa.

 Received forms 
right|upright=0.75|thumb|The typeface family Noto Serif CJK's regional forms for the character  in Chinese Simplified and Traditional as used in both Taiwan and Hong Kong (top), as well as Japanese and Korean (bottom)
With the use of the printing press, there was a considerable level of consolidation in forms prior to the standardization efforts of the 20th century, especially during the Ming. These orthodox Ming forms are in turn perennially represented in the touchstone references for written Chinese in the modern era, such as the 1716 Kangxi dictionary and the 1915 Zhonghua Da Zidian.

 Simplified characters 

One of the earliest proponents of character simplification was Lufei Kui, who proposed in 1909 that simplified characters should be used in education. In the years following the Xinhai Revolution and its associated May Fourth Movement, many anti-imperialist Chinese intellectuals sought ways to modernise China as quickly as possible. Traditional culture and values were challenged and subsequently blamed for societal and economic problems. Soon, people in the movement began pointing to the traditional Chinese writing system as an obstacle to the modernisation of China, proposing that it should either be reformed or abolished entirely. Lu Xun, a renowned 20th century author, stated 'If Chinese characters are not destroyed, then China will die'.
thumb|left|upright|The first standardised list of simplified forms, introduced in 1935 and consisting of 324 charactersDuring the 1930s and 1940s, discussions on character simplification took place within the Kuomintang government, and a large number of the intelligentsia maintained that character simplification would help boost literacy in China. In 1935, a table of 324 simplified characters collected by Qian Xuantong was  introduced as the first official batch of simplified characters; however, it was rescinded in 1936 due to fierce opposition within the party.

Although most closely associated with the PRC, the modern process of character simplification began well before 1949. Cursive  forms inspired many of the simplified characters, while others were already used in print, albeit not for most formal works. With the goal of increasing functional literacy, a major concern at the time, discussions on character simplification took place among Chinese intelligentsia and within the Kuomintang (KMT) government during the Republican period. This earlier initiative to simplify the Chinese writing system was later inherited and implemented by the Communists after its subsequent abandonment by the KMT.

The use of traditional versus simplified characters varies greatly, and can depend on both the local customs and the medium. Before the official reforms, character simplifications were not officially sanctioned and generally took the form of vulgar variants and idiosyncratic substitutions. Orthodox forms were mandatory in printed works, while unofficial simplified forms would be used in everyday writing or quick notes. Since the 1950s, the PRC has officially encouraged the use of simplified characters on the mainland. Hong Kong and Macau, still under colonial rule at the time, as well as the Republic of China were not affected by this reform. There is no firm rule for which characters to use, and often it is determined by tastes and inclinations of the audience and writer.

In other Sinophone countries, the use of simplified characters is generally more common among younger people, while many older Chinese speakers generation still use traditional forms. Outside of China, Chinese-language shop signs are also often written using traditional characters.

 People's Republic of China 

Most simplified forms in use today are the direct result of PRC initiatives during the 1950s and 60s. During the transitional years, while considerable confusion about the character forms was still rampant, transitional characters mixing simplified and yet-to-be simplified components appeared sporadically, then disappeared. Before largely settling on simplifying the existing system, some within the PRC, including Mao Zedong, also explored the total replacement of Chinese characters with a phonetic script, usually based on the Latin alphabet, leading to projects such as Gwoyeu Romatzyh and Latinxua Sin Wenz.

The PRC initiated the first round of simplifications with two documents published in 1956 and 1965. The majority of first round characters were drawn from conventional abbreviated or ancient forms. For example, the orthodox character  was written as  in the earlier clerical script; it used one fewer stroke, and was thus adopted as a simplified form. The  character was written as  in the ancient oracle bone script. This simpler form had remained in use later as a phonetic loan with a meaning of 'to say', and with the original meaning of 'cloud' it was instead written with an added  radical as a semantic indicator. When using simplified forms, these two characters are merged into .

A second round of simplifications was promulgated in 1977, but it was poorly received by the public, and fell out of official use very quickly, ultimately being formally rescinded in 1986. The second round of simplifications were unpopular in large part because the vast majority of its forms were completely new, in stark contrast to the many familiar variants present in the first round.

Two revised lists of simplified characters were published in 1988: the List of Commonly Used Characters in Modern Chinese having 2,500 common characters and 1,000 less common characters, and the Chart of Generally Utilised Characters of Modern Chinese  with 7,000 characters, including the 3,500 characters already listed above. In 2013, the revised Table of General Standard Chinese Characters replaced the 1988 lists as the new standard. The 2013 standard includes 8,105 characters, with 3,500 categorised as primary, 3,000 as secondary, and 1,605 as tertiary. GB 2312, an early version of the national encoding standard used in the PRC, has 6,763 code points. GB 18030, the modern, mandatory standard, has a much higher number. The Chinese Proficiency Test (HSK) covers 2,663 characters and 5,000 words at its highest level, while the Chinese Proficiency Grading Standards for International Chinese Language Education would cover 3,000 characters and 11,092 words at the highest level.

 Singapore 

Singapore underwent three successive rounds of character simplification promulgated by the Ministry of Education, with the first two having some simplifications that differed from those used in mainland China. The first round was published in 1969, and consisted of 498 simplified and 502 traditional characters. The second round in 1974 consisted of 2287 simplified characters, including 49 differences from the PRC system that were removed with the final round in 1976. In 1993, Singapore adopted the 1986 revisions made in mainland China.

Unlike in mainland China, where personal names may only be registered using simplified characters, Singapore parents have the option of registering their children's names in traditional characters.

 Malaysia 
In 1981, Malaysia began using a set of simplified characters in schools, completely identical to those used on the mainland. Chinese-language newspapers in the country are published using either set of characters—often with headlines in traditional characters with the body in simplified characters.

 Philippines 
In the Philippines, most Chinese schools and businesses still use the traditional characters with bopomofo, owing from influence from the Republic of China (Taiwan) due to the shared Hokkien heritage. Recently, however, more Chinese schools now use both simplified characters and pinyin. Since most readers of Chinese newspapers in the Philippines belong to the older generation, they are still published largely using traditional characters.

 Traditional characters 

thumb|upright=0.5|Variants of  in Chinese, Japanese, Korean, and Vietnamese styles

 Taiwan 
In Taiwan, the Ministry of Education's Chart of Standard Forms of Common National Characters lists 4,808 characters; the Chart of Standard Forms of Less-Than-Common National Characters  lists another 6,341 characters. The Chinese Standard Interchange Code (CNS11643)—the official national encoding standard—supports 48,027 characters in its 1992 version (currently over 96,000 characters), while the most widely used non-Unicode encoding scheme, BIG-5, supports only 13,053. The Test of Chinese as a Foreign Language (TOCFL) covers 8,000 words at its highest level. The Taiwan Benchmarks for the Chinese Language (TBCL), a guideline developed to describe levels of Chinese language proficiency, covers 3,100 characters and 14,425 words at its highest level (level seven).

 Hong Kong 
In Hong Kong, which uses traditional characters, the Education and Manpower Bureau's List of Graphemes of Commonly-Used Chinese Characters, containing 4,759 characters, is intended for use in elementary and junior secondary education.

 North America 
Chinese-language signage in the United States and Canada most often uses traditional characters. There is some effort to get municipal governments to implement more simplified character signage due to recent immigration from mainland China. Most Chinese-language newspapers in North America are printed using traditional characters.

 Kanji 

After World War II, the Japanese government also instituted a series of orthographic reforms. Some characters were given simplified forms called shinjitai; the older forms were then labelled the kyūjitai. The number of characters in common use was restricted, and formal lists of characters to be learned during each grade of school were established, first the 1850-character tōyō kanji list in 1945, the 1945-character jōyō kanji list in 1981, and a 2136-character reformed version of the jōyō kanji in 2010. Many variant forms of characters and obscure alternatives for common characters were officially discouraged. This was done with the goal of facilitating learning for children and simplifying kanji use in literature and periodicals. These are common guidelines, hence many characters outside these standards are still widely known and commonly used, especially those used for personal and place names,  as well as for some common words such as  in which both old and new forms of the character are both acceptable and widely known amongst native Japanese speakers.

 Comparison 

The following is a comparison of Chinese characters in the Standard Form of National Characters, Taiwan's standard of traditional characters, the PRC's Table of General Standard Chinese Characters for simplified characters, and the jōyō kanji. Generally, jōyō kanji are more similar to traditional characters than simplified characters are. 'Simplified' is often used more generally to refer to any variant from the Taiwan standard characters, and not necessarily a newly created character or a newly performed substitution.

 Variant forms 

thumb|Variants of the Chinese character for 'turtle', collected  from printed sources. The one at left is the traditional form used today in Taiwan and Hong Kong, , though  may look slightly different, or even like the second variant from the left, depending on font. The modern simplified forms used in China, , and in Japan, , are most similar to the variant in the middle of the bottom row, though neither is identical. A few more closely resemble the modern simplified form of the character 
thumb|Five of the thirty variant characters found in the preface of the Kangxi dictionary, but not listed within the dictionary itself
Just as letters in the Latin script have a characteristic shape, with lower-case letters mostly occupying the x-height, and certain letters having ascenders or descenders, Chinese characters occupy a roughly square area within which character components are to fit, in order to maintain a uniform size and shape—especially with small printed characters in Ming and sans-serif styles. Beginners often practise writing on graph paper with grid lines; Chinese people sometimes use the term , also translated as 'tetragraphs', in reference to written characters.

Despite standardisation, use of certain non-standard forms is common, especially in handwriting. In older sources, even authoritative ones, variant characters are easily found. For example, in the preface to the Kangxi dictionary, there are 30 variant characters which are not found in the dictionary itself.

 Contractions and abbreviations 
In certain cases, compound words and set phrases may be represented by single-character contractions. Some of these can be considered logograms, where characters represent whole words rather than syllable-morphemes, though these are generally considered as non-standard ligatures or abbreviations instead—similar to scribal abbreviations such as an ampersand for the digraph et, or an ñ for the digraph nn. These usually see use in handwriting or decorations, but sometimes in print as well. These ligatures are called ,  or  in Chinese; in the special case where two characters are combined, they are known as .

A commonly seen example is the 'double happiness' character , formed as a ligature of  and referred to by its disyllabic name . In handwriting, numbers are very frequently squeezed into one space or combined—common ligatures include , normally read as , , normally read as , and , normally read as  in Standard Mandarin, though other Chinese varieties may differ. For example,  is given a monosyllabic reading of  in Cantonese. Calendars often use numeral ligatures in order to save space, and in modern printings of the traditional Chinese calendar, the use of  is standard. Thus, one would generally write "21 March" as .

Modern examples particularly include Chinese characters for SI units. In Chinese these units are disyllabic and usually written with two characters, as with  from  and , or . However, in the 19th century these were often written via compound characters, pronounced disyllabically, such as  for  or  for —some of these characters were also used in Japan, where they were pronounced with borrowed European readings instead. These have now fallen out of general use, but are occasionally seen. Less systematic examples include , a contraction of . Since polysyllabic characters are often non-standard, they are often excluded from character dictionaries.

The use of such contractions is as old as the characters themselves, and they have frequently been used in religious or ritual contexts. In the oracle bone script, personal names, ritual items, and even phrases are commonly contracted into single characters, such as  becoming . A dramatic example is found in medieval manuscripts, where  is sometimes contracted to a single character composed of four  arranged in a 2×2 grid—derived from the 'grass' radicals  in the original characters. For the sake of consistency and standardisation, the Chinese government has sought to limit the contemporary use of polysyllabic characters in public writing.

Conversely, with the erhua phenomenon in Mandarin varieties, expressed via the fusion of the diminutive ;  suffix, some monosyllabic words may be written with two characters, such as in ; ; 'flower'.

 Multi-syllable morphemes 
Chinese characters are primarily morphosyllabic, meaning that there is usually a one-to-one correspondence between Chinese morphemes and spoken Chinese syllables, and therefore written Chinese characters. However, in modern Chinese varieties most common words are disyllabic and therefore dimorphemic. In modern Standard Chinese, 10% of morphemes are bound forms, only appearing in compound words. However, a few morphemes are disyllabic, some of which even date back to Classical Chinese. Excluding loanwords, these are typically words for plants and small animals, usually written with a pair of phono-semantic compounds sharing a common radical. Examples are  and . Note that the first character of 'butterfly' and the second character of 'coral' both have  as their phonetic component, and the 'insect' and 'jade' radicals for their respective semantic components—also present within the other character in their respective words. Neither of the aforementioned  characters exist as independent morphemes, except as poetic abbreviations of the disyllabic words.

 Rare and complex characters 
Often a rare character, complex, or antiquate variant will appear in personal or place names. As many computer encoding systems have historically included only the most common characters, this can create problems.

An example of potential difficulties are those encountered by Taiwanese politician Yu Shyi-kun , whose name contains the rare character . Newspapers have dealt with this problem in various ways, including the use of software to combine two existing, similar characters, embedding a picture of the character instead of encoding it as text, substituting a homophonic character in the hope that the reader would be able to make the correct inference, as often was the case with Yu Shyi-kun. Printed materials in Taiwan will often add bopomofo next to such a character. Japanese newspapers may render them in katakana instead, as is accepted practice for people writing characters in general for which they are unsure of the correct kanji.

There are also some extremely complex characters which have understandably become rather rare. According to Joël Bellassen (1989), the most complex Chinese character is , containing 64 strokes; this character fell from use around the 5th century. It might be argued, however, that while containing the most strokes, it is not necessarily the most complex character in terms of difficulty, as it simply requires writing the 16-stroke  four times in the space allotted for one. Another 64-stroke character is , similarly composed of four .

One of the most complex characters found in modern Chinese dictionaries is  with 36 strokes. Other stroke-rich characters include  with 39 strokes, and  with 52 strokes, meaning the loud noise of thunder. However, these are not in common use. The most complex character that can be input using the Microsoft New Phonetic IME 2002a for traditional Chinese is . It is composed of the 'dragon' radical  in triplicate, for a total of 16 × 3 = 48 strokes. Among the most complex characters in frequent modern use are  with 32 strokes,  with 29 strokes,  with 28 strokes, and  with 25 strokes. Also in occasional modern use is , a variant of , with 33 strokes.

In Japanese, an 84-stroke kokuji exists: 25px, normally read taito. It is composed of the 'cloud' character  atop the abovementioned triple-'dragon' character , also having the meaning of 'the appearance of a dragon in flight', it has been pronounced , , and . The most elaborate character in the jōyō kanji list is the 29-stroke , meaning 'depression' or 'melancholy'.

 Indexing 

Dozens of schemes have been devised for indexing Chinese characters and sorting them into dictionaries. Most of these are specific to the dictionary for which they were invented, and relatively few have seen widespread use. Often, character dictionaries incorporate several means for which users may locate entries. Traditionally, methods for organising and sorting Chinese dictionaries have been divided into three categories:
 Form-based orders, which sort by graphical properties, such as a character's constituent components,
 Sound-based orders, usually based on an extant transliteration scheme such as pinyin or bopomofo, and
 Meaning-based orders.

Many Chinese-, Japanese-, and Korean-language character dictionaries are indexed using a technique known as radical-and-stroke sorting, in which characters are grouped by common components called radicals, with radicals in turn ordered by number of strokes. The characters under each radical heading are in turn listed in order of their total number of strokes. Grouping by radical was introduced in the Shuowen Jiezi (2nd century AD), which used 540 radicals. The 214 Kangxi radicals were introduced in the Zihui (1615) and popularized by the Kangxi Dictionary of 1716. 

For example, to locate the character  'pine tree' in such a dictionary, the user first determines which part of the character is the radical—here, the radical is . One then counts the number of strokes in the radical (four). Within the radical index, usually located on one of the dictionary's inside covers, the page number of the section heading for  is listed, alongside those of the other radicals with four strokes. The user can then turn to the appropriate section heading, which will have a sub-index with page numbers that correspond to the number of strokes present in the remainder of the character. The right half of  also contains four strokes—upon turning to the corresponding page number, the user can now scan the entries to locate the character in question. Some dictionaries have a sub-index listing every character containing a given radical: if the user knows the number of strokes in the non-radical portion of the character, they can use this to obtain the page number directly.

Another form-based system is the four-corner method, in which characters are classified according to the shapes at each of the rectilinear character's corners. In modern Chinese, characters and words are also ordered by their frequency, as determined by use within a corpus, often with the aid of a computerised database. Important stroke-based sorting methods include stroke-count sorting, stroke-count-stroke-order sorting, GB stroke-based sorting and YES sorting.

Most modern Chinese dictionaries arrange the main character entries alphabetically according to pinyin spelling, but also provide a traditional radical-based index in the front of the dictionary. To find a character with unknown sound using one of these dictionaries, the reader determines the radical and stroke number of the character, as before, and locates the character in the radical index. The character's entry will give the character's pronunciation in pinyin or the page number of the main character entry.

 Number of characters 
thumb|420px|right|Cumulative frequency of simplified Chinese characters in modern text

Studies within China have suggested that literate individuals have an active vocabulary of between 3,000 and 4,000 characters., while specialists in fields like classical literature or history, are estimated to have a working vocabulary of between 5,000 and 6,000 characters. In addition, there are a number of  that are not generally used in formal written Chinese but represent colloquial terms in non-standard varieties of Chinese. In general, it is common practice to use standard characters to transcribe Chinese dialects when obvious cognates with Standard Mandarin words exist. However, when no obvious cognate could be found for a word, due to factors like irregular sound change or semantic drift in the meanings of characters, or the word originates from a non-Chinese source like a substratum from an earlier displaced language or a later borrowing from another language family, then characters are borrowed and used according to the rebus principle or invented in an ad hoc manner to transcribe it. These new characters are generally phono-semantic compounds, e.g. Min Nan ; 'person', although a few are compound ideographs, e.g. northeast Mandarin ; 'bad'. Except in the case of written Cantonese, there is no official orthography, and there may be several ways to write a dialectal word, often one that is etymologically correct and one or several that are based on the current pronunciation—e.g. the etymological  versus the phonetic  in Shanghainese, meaning 'eat'. Speakers of a dialect will generally recognise a dialectal word if it is transcribed according to phonetic considerations, while the etymologically correct form may be more difficult or impossible to recognise. For example, few Gan speakers would recognise the character  meaning 'to lean' in their dialect, because this character is now archaic in Standard Mandarin. The historically "correct" transcription is often so obscure that it is only uncovered after considerable research in philology and historical phonology, and may be disputed by other researchers.

As an exception, written Cantonese is widespread in Hong Kong, even for certain formal documents, due to the former British colonial administration's recognition of Cantonese for use for official purposes. In Taiwan, there is also a body of semi-official characters used to represent Taiwanese Hokkien and Hakka. For example, the Hakka vernacular character , pronounced  , means 'to kill'. Other varieties of Chinese with a significant number of speakers—like Shanghainese Wu, Gan Chinese, and Sichuanese Mandarin—also have their own series of characters, but these are not often seen, except on advertising billboards directed toward locals and are not used in formal settings except to give precise transcriptions of witness statements in legal proceedings.  Written Standard Mandarin is the preference for all mainland regions.

 Kanji 

thumb|upright|Kanji for , with equivalent Korean pronunciation  and equivalent Chinese pronunciation 

The Japanese Ministry of Education has designated 2,136 jōyō kanji to be taught in primary and secondary school. The list is a recommendation, not a restriction, and many characters missing from it are still in common use.

Character usage is officially restricted in names, which may contain only government-approved characters. Since the jōyō kanji list excludes many characters that have been used in personal and place names for generations, an additional list, referred to as the jinmeiyō kanji is published. It currently contains 983 characters.

Today, a well-educated Japanese person may know upwards of 3,500 characters. The kanji kentei tests a speaker's ability to read and write kanji. The highest level of the kanji kentei tests on approximately 6,000 kanji, corresponding to the JIS X 0208 list.

 Hanja 
The South Korean Basic Hanja for Educational Use is a set of 1,800 characters standardised in 1972, with the first 900 hanja taught to middle school students, and the rest taught to high school students.

In March 1991, the Supreme Court of Korea published the 2,854-character Table of Hanja for Use in Personal Names.National Academy of the Korean Language (1991)  The list expanded gradually: by 2015 there were 8,142 hanja, including the set of basic hanja, permitted for use in Korean names.

 Large character lists 
Ostensibly, Chinese characters can be created and used arbitrarily, though they are unlikely to gain widespread use or inclusion in official character sets. Counting the entries within major Chinese dictionaries is a viable means of estimating the growth of the character inventory over time.

Estimates of the total number of characters in modern use can be sourced from encoding schemes and dictionaries: according to sources from mainland China, Taiwan, Hong Kong, Japan, and Korea, this number is likely around 15,000. For comparison, Unicode encodes over 90,000 CJK Unified Ideographs.

+ Number of characters in monolingual Chinese dictionaries Year     100  Shuowen Jiezi  9,353 230  Shenglei  11,520 350  Zilin  12,824 543  Yupian  16,917 601  Qieyun  12,158 732  Tangyun  15,000 753  Yunhai jingyuan  26,911 997  Longkan Shoujian  26,430 1011  Guangyun  26,194 1066  Leipian  31,319 1039  Jiyun  53,525 1615  Zihui  33,179 1675  Zhengzitong  33,440 1716  Kangxi Dictionary  47,035 1915  Zhonghua Da Zidian  48,000 1989  Hanyu Da Zidian  54,678 1994  Zhonghua Zihai  85,568 2017  Dictionary of Chinese Character Variants  106,330 Official website for "The Dictionary of Chinese Variant Form", Introductory page

+ Number of characters in bilingual Chinese dictionaries! Year  Country  Name of dictionary  Number of characters 2003  Japan  Dai Kan-Wa Jiten  50,305 2008  South Korea  Han-Han Dae Sajeon  53,667

Even the Zhonghua Zihai does not include characters in the Chinese family of scripts created to represent non-Chinese languages, except the unique characters in use in Japan and Korea. Characters formed by Chinese principles in other languages include the roughly 1,500 Japanese-made kokuji given in the Kokuji no Jiten,Hida & Sugawara, 1990, Tokyodo Shuppan. the Korean gukja, the over 10,000 sawndip characters still in use in Guangxi, and the almost 20,000 Nôm characters formerly used in Vietnam. More divergent descendants of Chinese script include Tangut script, which created over 5,000 characters with similar strokes but different formation principles to Chinese characters.

Modified radicals and new variants are two common reasons for the ever-increasing number of characters. There are about 300 radicals, with 100 being in common use. Creating a new character by modifying the radical is an easy way to disambiguate homographs among picto-phonetic compounds (). This practice began long before the Qin standardisation of Chinese script. The traditional third-person personal pronoun , which is written with the 'person' radical, illustrates modifying signifiers in order to form new characters. In modern usage, there is a graphical distinction between  with the 'female' radical,  with the 'animal' radical,  with the 'roof' radical, and  with the 'deity' radical, One consequence of modifying radicals is the fossilisation of rare and obscure variant logographs, some of which are not even found in Classical Chinese texts. For instance, , which combines the 'grain' radical with the 'mouth' radical, has variants  with the radicals reversed, and  with the 'flute' radical instead.

 See also 

 Chinese family of scripts
 Adoption of Chinese literary culture
 Character amnesia
 Modern Chinese characters
 Chinese calligraphy
 Chinese numerals
 Chinese punctuation
 Eight Principles of Yong
 Stroke order
 Chinese input methods for computers
 Horizontal and vertical writing in East Asian scripts
 Chinese character forms
 Chinese character meanings
 Chinese character orders
 Chinese character sounds
 Chinese character encoding
 Transcription into Chinese characters
 Romanisation of Chinese

 Notes 

 References 
 Citations 

 Works cited 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  (English translation of Wénzìxué Gàiyào , Shangwu, 1988.)
 
 
  (preprint)
 
 
 
 
 
 
 
 
 

 Further reading 
 
 
Early works of historical interest
 
 
 
 
 
 
 
 
  Translated by L.C. Hopkins with a Memoir of the Translator by W. Perceval Yetts

 External links 

 History and construction of Chinese characters 
 Excerpt from Visible Speech: The Diverse Oneness of Writing Systems by John DeFrancis, 1989 by the University of Hawai'i Press. Used by permission of the University of Hawai'i Press.

 Online dictionaries and character reference 
 Chinese Text Project Dictionary Comprehensive character dictionary including data for all Chinese characters in Unicode, and exemplary usage from early Chinese texts.
 Evolution of Chinese Characters
 Richard Sears, Chinese Etymology
 Da, Jun, Chinese text computing – statistics on use of Chinese characters

 Chinese characters in computing 
 Unihan Database: Chinese, Japanese, and Korean references, readings, and meanings for all the Chinese and Chinese-derived characters in the Unicode character set
 Daoulagad Han – Mobile OCR hanzi dictionary, OCR interface to the UniHan database

 Early works of historical interest 
 
 

 
Category:Chinese culture
Category:East Asian culture
Category:East Asia
Category:Southeast Asia
Category:Writing systems without word boundaries