The three corners of the triangle shaped Jewish cookies are said to represent the three-corner hat that the villain Hamen from the purim story often wore. Oznei Haman, literally means Haman's ears. The minhag (Jewish tradition passed on from previous generations) is that these little pastries refer to the cutting off of the wicked Haman's ears before he was hanged. Taking a bite out of a hamentaschen cookie symbolizes victory over Hamen, preventing him from carrying out his evil plans for Queen Esther and the Jewish people.