Coptic alphabet

The Coptic alphabet is the script used for writing the Coptic language. The repertoire of glyphs is based on the Greek alphabet augmented by letters borrowed from the Egyptian Demotic and is the first alphabetic script used for the Egyptian language. There are several Coptic alphabets, as the Coptic writing system may vary greatly among the various dialects and subdialects of the Coptic language.
History.
The Coptic alphabet has a long history, going back to the Hellenistic period, when the Greek alphabet was used to transcribe Demotic texts, with the aim of recording the correct pronunciation of Demotic. During the first two centuries of the Common Era, an entire series of spiritual texts were written in what scholars term "Old Coptic", Egyptian language texts written in the Greek alphabet. A number of letters, however, were derived from Demotic, and many of these (though not all) are used in "true" Coptic writing. With the spread of Christianity in Egypt, by the late 3rd century, knowledge of hieroglyphic writing was lost, as well as Demotic slightly later, making way for a writing system more closely associated with the Christian church. By the 4th century, the Coptic alphabet was "standardised", particularly for the Sahidic dialect. (There are a number of differences between the alphabets as used in the various dialects in Coptic.) Coptic is not generally used today except by the members of the Coptic Orthodox Church of Alexandria to write their religious texts. All the Gnostic codices found in Nag Hammadi used the Coptic alphabet.
The Old Nubian alphabet—used to write Old Nubian, a Nilo-Saharan language —is written mainly in an uncial Greek alphabet, which borrows Coptic and Meroitic letters of Demotic origin into its inventory.
Form.
The Coptic alphabet was the first Egyptian writing system to indicate vowels, making Coptic documents invaluable for the interpretation of earlier Egyptian texts. Some Egyptian syllables had sonorants but no vowels; in Sahidic, these were written in Coptic with a line above the entire syllable. Various scribal schools made limited use of diacritics: some used an apostrophe as a word divider and to mark clitics, a function of determinatives in logographic Egyptian; others used diereses over and to show that these started a new syllable, others a circumflex over any vowel for the same purpose.
The Coptic alphabet's glyphs are largely based on the Greek alphabet, another help in interpreting older Egyptian texts, with 24 letters of Greek origin; 6 or 7 more were retained from Demotic, depending on the dialect (6 in Sahidic, another each in Bohairic and Akhmimic). In addition to the alphabetic letters, the letter ϯ stood for the syllable or .
As the Coptic alphabet is simply a typeface of the Greek alphabet, with a few added letters, it can be used to write Greek without any transliteration schemes. Latin equivalents would include the Icelandic alphabet (which likewise has added letters), or the Fraktur alphabet (which has distinctive forms). While initially unified with the Greek alphabet by Unicode, a proposal was later accepted to separate it, with the proposal noting that Coptic is never written using modern Greek letter-forms (unlike German, which may be written with Fraktur or Roman Antiqua letter-forms), and that the Coptic letter-forms have closer mutual legibility with the Greek-based letters incorporated into the separately encoded Cyrillic alphabet than with the forms used in modern Greek.
Letters.
These are the letters that are used for writing the Coptic language.
Letters derived from Demotic.
In Old Coptic, there were a large number of Demotic Egyptian characters, including some logograms. They were soon reduced to half a dozen, for sounds not covered by the Greek alphabet. The following letters remained:
Unicode.
In Unicode, most Coptic letters formerly shared codepoints with similar Greek letters, but a disunification was accepted for version 4.1, which appeared in 2005. The new Coptic block is U+2C80 to U+2CFF. Most fonts contained in mainstream operating systems use a distinctive Byzantine style for this block. The Greek block includes seven Coptic letters (U+03E2–U+03EF highlighted below) derived from Demotic, and these need to be included in any complete implementation of Coptic.
Diacritics and punctuation.
These are also included in the Unicode specification.
Combining diacritics.
These are codepoints applied after that of the character they modify.
Macrons and overlines.
Coptic uses to indicate syllabic consonants, for example .
Coptic abbreviations use to draw a continuous line across the remaining letters of an abbreviated word. It extends from the left edge of the first letter to the right edge of the last letter. For example, , a common abbreviation for 'spirit'.
A different kind of overline uses , , and to distinguish the spelling of certain common words or to highlight proper names of divinities and heroes.
For this the line begins in the middle of the first letter and continues to the middle of the last letter. A few examples: , , .
Coptic numerals are indicated with letters of the alphabet such as for 1.
Sometimes numerical use is indicated with a continuous line above using as in for 1,888 (where " is 1,000 and " is 888). Multiples of 1,000 can be indicated by a continuous double line above using as in for 1,000.