ouroboros.The Ouroboros (Greek Ουροβόρος, from ουροβόρος όφις "tail-devouring snake", also spelled Ourorboros, Oroborus, Uroboros or Uroborus, in English pronounced /ʊˈrɒbɔrɔs/ or /ˌjʊəroʊˈbɒrəs/), is an ancient symbol depicting a serpent or dragon swallowing its own tail and forming a circle.