Explanation
In Greece, the OK hand sign (thumb and index finger forming a circle) is a deeply offensive insult, equivalent to telling someone to perform a sexual act or calling them a homosexual. It is considered a 'moutza' variant and should never be used in any context.
Local Tip
Avoid making this gesture entirely; if you need to indicate approval, use a thumbs-up or a verbal 'endaxi' (okay).
How it compares elsewhere
In Japan, the OK sign means 'money' or 'OK' and is generally positive, though context matters.
In Brazil, it is a vulgar insult similar to Greece, often implying a sexual act.
In Turkey, the gesture is also offensive, often used to imply homosexuality or as an insult.