The ouroboros (/ˌjʊərəˈbɒrəs, ˌjʊəroʊ-/;^[2] Ancient Greek: οὐροβόρος ὄφις "tail-devouring snake") is an ancient symbol depicting a serpent ordragon eating its own tail.

It symbolizes self-reflexivity, introspection, or cyclicality,^[3] especially in the sense of something constantly re-creating itself, the eternal return, which operate in cycles that begin anew as soon as they end.

https://en.wikipedia.org/wiki/Ouroboros