<Li> Hat tip or doff, a salutation or show of respect made by two people removing their hats </Li> <Li> Head bobble, an affirmative response or acknowledgement common in India </Li> <Li> Head shake, indicates a negative reaction to a query or a rejection in English - speaking cultures; also used occasionally in disbelief </Li> <Li> Headbanging a deep and abrupt shaking of the head, sometimes to whip long hair back and forth . Done in time with music, headbanging is used as a sign of excitement and appreciation of a performance . </Li>

Different types of single hand and double hand gestures