Ouroboros (or oroboro or Ouroboros) is a symbol represented by a snake or a dragon biting its own tail. The name comes from ancient Greek: οὐρά (Oura) means "tail" and βόρος (Boron), meaning "devour". Thus, the word refers to "one who devours its own tail." Their representation symbolizes eternity. It is related to alchemy, which is sometimes represented as two mythical animals, biting the tail of each other.