Ring 0 or zero ring or variations, may refer to: Arts and entertainment Ring 0: Birthday, a Japanese horror prequel film The Ring Volume 0: Birthday, a subsequent manga
Technology Ring 0 (computer security), the highest privilege level Telephone dialling instructions to access a switchboard operator
Other uses Zero ring, the trivial ring in mathematics ring theory O̊, the letter "O" with a ring diacritical mark
See also
Birthday (short story collection), a Japanese anthology containing prequels and sequels to Ring Ring road (disambiguation) Ring (disambiguation)