Obscene gesture
An obscene gesture is a movement or position of the body, especially of the hands or arms, that is considered exceedingly offensive or vulgar in some particular cultures. Such gestures are often sexually suggestive.

The Finger

Although "the finger" has been called "the universal sign of disrespect", it is not truly universal. For example, in Japanese Sign Language, when the palm is facing out, it is recognized as the character せ . Many other gestures are used in addition to, or in lieu of, the finger in various parts of the world to express the same sentiment. In some parts of the world, "the finger" does not have any meaning at all.

In India, Pakistan, and Sri Lanka the social circles exposed to the western cultures use the middle finger gesture in the same sense that it is used in those cultures. The same is true for most South Asian countries.

In Portugal this gesture is also called "Pirete" or "Manguito".

V Sign

In the Commonwealth of Nations countries (except Canada), the V sign as an insult (the middle and index fingers raised, and given with back of the hand towards the recipient) serves a similar purpose to The finger. The V sign with palm face outwards instead is a sign of peace however.

Dulya

More commonly in Russian-influenced areas, the dulya (also known as fig sign or shysh). This gesture is most commonly used to refuse giving of aid or to disagree with the target of gesture. Usually it is connected with requests for a financial loan or assistance with performing physical work. The gesture is typically made with the hand and fingers curled and the thumb thrust between the middle and index fingers. This gesture is also used similarly in Indonesia, Turkey, Korea, China, Mongolia, Hungary (called "fityisz"), and Romania ("figa"). In parts of the United States, the dulya is often used after grabbing a young child's nose in order to make it appear that it has been removed from their face, often accompanied by the phrase, "I've got your nose."

Corna

The sign of the horns, or corna in Italian ("horned hand"), is a gesture with various meanings depending on culture, context, or the placement or movement of the gesture. It is especially common in Italy and the Mediterranean region, where it generally takes on two different meanings depending on context and positioning of the hand. The first, more innocuous usage of the gesture in Italy and the Mediterranean is deployed for apotropaic or superstitious purposes, as a way to ward off bad luck or the "evil eye". This usage of the gesture may also be employed when confronted with unfortunate events or even when such events are mentioned, and it is usually performed with the fingers pointed downward (or simply not directed towards someone) to distinguish the apotropaic usage of the gesture from the obscene usage of the gesture.

The second usage of the gesture, also found in Italy and other Mediterranean and Latin countries (including Argentina, Brazil, Colombia, Cuba, France, Greece, Portugal, Spain, and Uruguay) is instead obscene, disrespectful, and insulting.  Unlike the first usage of the gesture, this obscene usage of the gesture involves pointing the two fingers upward or directing the gesture towards someone and swiveling the hand back and forth. This usage of the gesture implies cuckoldry in the person it is directed towards. The common words for cuckolded in Italian, Greek and Spanish are ,  () and  respectively, literally "horned".

Moutza

In Greece, the five fingers are spread wide and the palm is pushed towards someone in a gesture known as the Moutza. The middle finger is still used though, and it is considered more insulting. Another variation of the middle finger is used, where all the fingers but the middle one are spread wide while moving the hand back and forth in the axis the middle finger creates. In this gesture, the thumb sometimes touches the middle finger. The insult of this is equivalent to the finger.

In Iranian culture, a similar gesture is used to represent "Dirt on your head", a verbal insult that is often used, suggesting the death and subsequent burial of the receiver.

In some African and Caribbean countries, a similarly obscene gesture is extending all five digits with the palm facing forward, meaning "you have five fathers" (thus calling someone a bastard).

In Iraqi and Assyrian culture, abruptly thrusting the palm of the hand to someone means they are worthy of shame and are dishonourable.

Thumbs up

In former Persia, mainly Iran and Iraq, a gesture involving exposing only the thumb in a vertical orientation—a thumbs up—is used instead of the finger to express roughly the same sentiment – roughly equivalent in meaning to "shove it up your ass/arse," "up yours," or "go fuck yourself."

In some Arab countries, especially Egypt, the middle finger is lowered towards the palm and pointed towards someone, while all other fingers are kept straight. It could be considered the opposite movement of the tradition middle finger gesture, but it serves the same purpose and meaning.

In William Shakespeare's play Romeo and Juliet, Capulet's servant Sampson starts a fight by "biting his thumb" at Abram, Montague's servant. This gesture can be interpreted as being equivalent to giving someone the middle finger.

Okay gesture

While widespread use of the OK gesture has granted it an international connotation of assent, it also bears negative, vulgar, or offensive meanings in parts of the Middle East and the Mediterranean regions. In contrast to Japan's use of the expression to represent coins and wealth, the gesture's "O" shape stands for "zero" meaning "worth nothing" in France, Belgium, and Tunisia. 

In many Mediterranean countries such as Turkey, Tunisia, and Greece, as well as in the Middle East, parts of Germany, and several South American countries, the gesture may be interpreted as a vulgar expression resembling a human anus, either as an insult ("You are an asshole"), or an offensive reference to homosexuality and the act of sodomy. In Brazil it can be synonymous with giving someone the middle finger.

In the Arab world, this sign represents the evil eye, and is used as a curse, sometimes in conjunction with verbal condemnation.