Apotropaic magic or protective magic is a type of magic intended to turn away harm or evil influences, as in deflecting misfortune or averting the evil eye. Apotropaic observances may also be practiced out of superstition or out of tradition, as in good luck charms, amulets, or gestures such as crossed fingers or knocking on wood, or as part of complex rituals of social transformation such as migration. Many different objects and charms are used for protection by many peoples throughout history.