The tyet (Ancient Egyptian: tjt), sometimes called the knot of Isis or girdle of Isis, is an ancient Egyptian symbol that came to be connected with the goddess Isis. It is believed to represent the concept of eternal life and is often associated with protection, fertility, and rebirth. In ancient Egyptian art, the tyet symbol was usually depicted as a knot or a loop of rope with a loop at each end.
It was thought to be a magical knot that bound and released the magical power of Isis. The symbol was also believed to protect the wearer from harm, and to bring them good luck, prosperity, and fertility. Additionally, it was believed that the tyet symbol could bring about resurrection and immortality.