The tyet (Egyptian tjt) is an ancient Egyptian symbol of the goddess Isis; its exact origin is unknown.
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Description
In many respects the tyet resembles an ankh, except that its arms curve down. Its meaning is also reminiscent of the ankh, as it is often translated to mean "welfare" or "life". Frequently called "the Knot of Isis" because it resembles a knot used to secure the garments that the Egyptian gods wore. Also tyet as buckle of Isis, girdle of Isis, and the blood of Isis.
Meaning
The meaning of "the Blood of Isis" is more obscure, but it was often used as a funerary amulet made of a red stone or of glass. It is also speculated that the Tyet represents the menstrual blood flow from Isis' womb and its magical properties.
Use
It is mentioned in the 156th spell for the Book of the Dead:
You possess your blood, Isis, you possess your power, Isis, you possess your magic, Isis. The amulet is a protection for this Great One, which will drive off anyone who would perform a criminal act against him.
In all these cases it seems to represent the ideas of resurrection and eternal life. The Isis Knot was frequently used as a magical amulet and was often buried with a body or worn on a belt.
Elsewhere
The symbol can be compared with the Minoan sacral knot, a symbol of a knot with a projecting loop found in Knossos of Crete.