The mengdu (Jeju and Korean: 멩두, romanized: mengdu), also called the three mengdu (삼멩두, sam-mengdu) and the three mengdu of the sun and moon (일월삼멩두, irwol sam-mengdu), are a set of three kinds of brass ritual devices—a pair of knives, a bell, and divination implements—which are the symbols of shamanic priesthood in the Korean shamanism of southern Jeju Island. Although similar ritual devices are found in mainland Korea, the religious reverence accorded to the mengdu is unique to Jeju.