The Ouroboros or Uroborus[a] is an ancient symbol depicting a serpent or dragon eating its own tail. 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 (compare with phoenix).
The ouroboros is traditionally depicted as a serpent or dragon in the process of swallowing its own tail, resulting in the formation of a circle. Unsurprisingly the ouroboros is most often regarded as a symbol of infinity and renewal, though it is also widely interpreted to be demonstrating the principles of cyclical transformation and the creation of life through death. It has also been used as a symbol for totality, self-sufficiency, androgyny, mercury, and truth.