Grager

A grager (Yiddish: גראַגער, 'rattler'), also gragger, grogger or gregger, is a noisemaking device, most commonly a ratchet, used to make noise by the congregation when the name of Haman is read out during the recitation of the Megillah in the synagogue during the celebration of Purim in order to blot out Haman's name. This is done in accordance with the passage in the Midrash which commented that the verse from Deuteronomy "Thou shalt blot out the remembrance of Amalek" must be understood "even from wood and stones". Traditionally Haman is believed to be an offspring of Amalek, and a tradition had developed to write the name of Haman on stones and to knock them until the name is blotted out.