Ring of O

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The Ring of O is a specially designed ring which has been worn as a distinctive mark among BDSM practitioners, mainly in continental Europe — and especially the German-speaking countries — since the 1990s. Its use is relatively widespread within this subculture. Its name derives from the name of the central character in the classic BDSM novel Story of O (written by Anne Desclos using the name Pauline Réage), who wore an analogous ring.