The Ouroboros or Uroborus is a symbol depicting a serpent or a dragon eating its own tail.
It is an ancient, sui generis international and pretty much all embracing symbol known since 1100 B.C. and met in history of Ancient Egypt, China, Greece, India and Scandinavia, and used in Gnosticism, Alchemy and psychology.
The Ouroboros often represents self-reflexivity or cyclicality, especially in the sense of something constantly re-creating itself, the eternal return, and other things perceived as cycles that begin anew as soon as they end. It can also represent the idea of primordial unity related to something existing in or persisting before any beginning with such force or qualities it can not be extinguished. The Ouroboros has been important in religious and mythological symbolism, but has also been frequently used in alchemical illustrations, where it symbolizes the circular nature of the alchemist’s opus. It is also often associated with Gnosticism and Hermeticism.
Carl Jung interpreted the Ouroboros as having an archetypal significance to the human psyche. The Jungian psychologist Erich Neumann writes of it as a representation of the pre-ego “dawn state”, depicting the undifferentiated infancy experience of both mankind and the individual child.
To read more use http://en.wikipedia.org/wiki/Oroboro