While widespread use of the OK gesture has granted it an international meaning of assent, it also bears negative, vulgar, or offensive meanings in many regions of the world. 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 and Tunisia. In many Mediterranean countries such as Turkey, Tunisia, and Greece, as well as in the Middle East, parts of Germany, and many parts of Latin America, the gesture may be interpreted as a vulgar expression resembling a human anus, referring to sex, either as an insult (“You are an asshole”), or a homophobic reaction to a symbol of homosexuality and the act of sodomy.

https://en.wikipedia.org/wiki/OK_gesture

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