ouroboros

The ouroboros or uroboros (/ˌ(j)ʊərəˈbɒrəs/, also UK: /uːˈrɒbərɒs/, US: /-oʊs/) is an ancient symbol depicting a serpent or dragon eating its own tail. ... The ouroboros is often interpreted as a symbol for eternal cyclic renewal or a cycle of life, death, and rebirth.