"C", short for and known as "Chaos" (Ｃ（カオス） Kaosu) in the Japanese version, is an archetype of Xyz Monsters supported by the anime effects of the "Rank-Up-Magic" cards, and used by various Duelists in the Yu-Gi-Oh! ZEXAL anime. It encompasses two sub-archetypes, "CXyz" and "Number C". Both of those sub-archetypes are explicitly supported by the support cards in the OCG, while the archetypes are combined into this one in the anime.