pentaculum

pentaculum [cf. OF pentacle < LL penta+-culum, OF pentacol < pend a col] , pentacle, ornament hung from the neck as prophylactic. ~a sunt signa, sigilla, vel delineamenta mirandis et incognitis aliquando literis et characteribus implicata, quae collo appensa creduntur a malignis spiritibus et fascino quovis preservare LC 258.