Evidence that a woman is a witch and should be burned forthwith. In early times it meant an unfortunate birth defect on some women that took the form of a third nipple on the chest. Later witch hunters were not so discriminating and pointed to any mark, scar, mole, cyst, or mosquito bite found on any part of the body of the hapless bitch, thereby ensuring arrest, conviction, and subsequent barbecue.
Behold the witch's tit! By Our Lady, thou art a foul and monstrous..uh..hmmmm...! Anybody got a match?