Set Ouroboros

As Wikipedia says: …”The ouroboros is an ancient symbol depicting a serpent or dragon eating its own tail to symbolize introspection, the eternal return or cyclicality, especially in the sense of something constantly re-creating itself. It also represents the infinite cycle of nature’s endless creation and destruction, life and death.”
As VirginGrip says: “The Ouroboros means limitless options for routes on your boulder or your climbing wall. Vary it for as long as you like!”