Gestures are a form of nonverbal communication in which visible bodily actions are used to communicate important messages, either in place of speech or together and in parallel with spoken words. Gestures include movement of the hands, face, or other parts of the body.
Gestures are culture-specific and can convey very different meanings in different social or cultural settings. Although some gestures, such as the ubiquitous act of pointing, differ little from one place to another, most gestures do not have invariable or universal meanings but connote specific meanings in particular cultures. A single emblematic gesture can have very different significance in different cultural contexts, ranging from complimentary to highly offensive. [via]
Certainly most of these gestures you use every day. Check out what they mean!