Такое кольцо называется Ouroboros.
Alternative spellings include: Oroborus, Uroboros, and Oureboros.
The Ouroboros is any image of a snake, worm, serpent, or dragon biting or devouring its own tail. Generally taking on a circular form, the symbol is representative of many broad concepts.
The image of the Ouroboros has been seen used in ancient Egyptian, Japanese, Indian, and Greek texts, and European woodcuts. Even Aztecs and Native American Indian tribes have used it. The serpent biting its tail is found in other mythoi as well, including Norse myth, where the serpent's name is Jormungandr.
The "tail-devourer" is a very common symbol in alchemy and magic. It occurs around the world in various forms, and is generally said to be a symbol of eternity.