An example is the Vitarka mudra, the gesture of discussion and transmission of Buddhist teaching. Each mudra has a specific meaning, playing a central role in Hindu and Buddhist iconography. In Hinduism and Buddhism, a mudra ( Sanskrit, meaning either "posture" or "currency" depending on the interpretation) is a symbolic gesture made with the hand or fingers. Religious and spiritual gestures are also common, such as the Christian sign of the cross. This may include elaborate dances and other movements. Many animals, including humans, use gestures to initiate a mating ritual. Gestures play a major role in many aspects of human life.