(From the Latin sigilum, meaning “seal” or “signature,” although some say it may be related to the Hebrew segulah, which means action, word, or something that has a spiritual effect.) In ceremonial magick, a sigil is considered to be the signature of an entity summoned by the magician and used to control that entity. In some forms of magick, a sigil is a representation of the Will of the magician and used to empower the goal of the Will through various means.