The serpent, when forming a ring with its tail in its mouth, is a clear and widespread symbol of the "All-in-All", the totality of existence, infinity and the cyclic nature of the cosmos. The most well known version of this is the Aegypto-Greek ourobouros. It is believed to have been inspired by the Milky Way, as some ancient texts refer to a serpent of light residing in the heavens. The Ancient Egyptians associated it with Wadjet, one of their oldest deities, as well as another aspect, Hathor. In Norse mythology the World Serpent (or Midgard serpent) known as Jörmungandr encircled the world in the ocean's abyss biting its own tail.