A "Hand Wave" is a common gesture used to greet someone or say goodbye. It typically involves raising one hand and moving it side to side or up and down. This simple action can convey friendliness and acknowledgment without the need for words. In various cultures, the meaning of a hand wave can differ. For example, in some places, a wave may signify a warm welcome, while in others, it might be used to signal a farewell. The gesture is often associated with social interactions and can be seen in contexts ranging from casual encounters to formal events.