Oroborous. The Ouroboros "tail-devouring snake", is an ancient symbol depicting a serpent or dragon swallowing its own tail thus forming a circle. 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 also represent the idea of primordial unity related to something existing in or persisting from the beginning with such force or qualities that it cannot be extinguished. The Ouroboros has 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 (Tehuti).