The Word of the Day comes from "The Wreck" by Meg Keneally that I am currently buddy reading with the wonderful Nat K.
noun noun: ouroboros
a circular symbol depicting a snake, or less commonly a dragon, swallowing its tail, as an emblem of wholeness or infinity.
Origin 1940s: from Greek (drakōn) ouroboros ‘(snake) devouring its tail’.
The ouroboros or uroboros is an ancient symbol depicting a serpent or dragon eating its own tail. Originating in ancient Egyptian iconography, the ouroboros entered western tradition via Greek magical tradition and was adopted as a symbol in Gnosticism and Hermeticism and most notably in alchemy.