Hand gestures and body gestures can have meanings in other countries and cultures that are not
what you think they are -- for instance, an "OK" sign in the United States is a circle made with the thumb and forefinger; in parts of Europe, it could mean that the person to whom you're making the gesture is a big fat zero. In Brazil, it could mean... um... something really rude. (That would be an insult.) And in some countries, the number three could be signified by a gesture which looks similar. So... check out our list of Hand Gestures Around the World
, and then add yours!
And don't worry about it too much; the most universal gesture is one you know and (hopefully) don't use as a matter of course, anyway; if you slip up while abroad and accidentally tell someone to jump in the lake, with their grandmother who is wearing army boots, by pulling out an eyelash (or something equally obscure), don't worry about it. Chances are the person you're insulting has noticed you're from the US of A and thus don't know about the whole eyelash thing...
Readers Respond: Add a Hand Gesture or Body Language to the List