Nonverbal communication can be divided into several categories, such as facial expressions, head movements, hand and arm gestures, physical space, touching, eye contact, and physical postures. However, the hand gestures and body language on which people rely on more heavily when they are unable to verbally interact do not always mean the same thing in every country. Gestures used on a daily basis in the U.S. to portray positive emotion or agreement, for example, might mean something highly offensive in a foreign land.
Here is a comprehensive list of common gestures and their various meanings in different countries. Read it carefully, cause some of them might save you from getting into hot water in foreign countries.