The tit symbol (pronounced teet) illustrates a knotted piece of cloth whose early meaning is unknown, but in the New Kingdom it was clearly associated with the goddess Isis, the great magician and wife of Osiris. By this time, the tit was also associated with blood of Isis. The tit sign was considered a potent symbol of protection in the afterlife and the Book of the Dead specifies that the tit be made of blood-red stone, like this example, and placed at the deceased's neck.

Knots were widely used as amulets because the Egyptians believed they bound and released magic (for another amuletic knot see 27.3.398).