So, a thumb raised upward with a clenched fist in many countries, including Mexico, means everything is fine. In Turkey, however, this gesture is considered indecent, and one can, to put it mildly, be punished for it without any preliminary explanation. An open palm in most countries of the world is a sign of friendly greeting. But not in Greece: for Greeks it means an impudent threat.
The traditional "OK" gesture - the index finger and thumb pressed together - indicates extreme irritation and fury in Brazil. In Italy it is considered sexual in an offensive sense. The fig, which is offensive to us, is interpreted by the same Brazilians and Portuguese as a wish for happiness or warding off evil spirits. But Germans use it to address women of easy virtue.