The Ouroboros or uroborus is an ancient symbol depicting a serpent or dragon eating its own tail. Originating in ancient Egyptian iconography, the ouroboros entered western tradition via Greek magical tradition and was adopted as a symbol in Gnosticism and Hermeticism and most notably in alchemy. Via medieval alchemical tradition, the symbol entered Renaissance magic and modern symbolism, often taken to symbolise introspection, the eternal return or cyclicality, especially in the sense of something constantly re-creating itself. It also represents the infinite cycle of nature's endless creation and destruction, life, and death.
Below, pictured, is the first known representation of Ouroboros on one of the sarcophagus of ToutAnkhAmun