talisman

n.; pl. Talismans [ Sp., from Ar. tilism, tilsam, a magical image, pl. tilsamān, fr. Gr. &unr_; tribute, tax, LGr., an initiation, incantation, from &unr_; to complete, perform, to play taxes, to make perfect, to initiate, especially in the mysteries, fr. &unr_; completion, end. ] 1. A magical figure cut or engraved under certain superstitious observances of the configuration of the heavens, to which wonderful effects are ascribed; the seal, figure, character, or image, of a heavenly sign, constellation, or planet, engraved on a sympathetic stone, or on a metal corresponding to the star, in order to receive its influence. [ 1913 Webster ]

2. Hence, something that produces extraordinary effects, esp. in averting or repelling evil; an amulet; a charm; as, a talisman to avert diseases. Swift. [ 1913 Webster ]