Carabiner

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A carabiner or karabiner (/ˌkærəˈbiːnər/),^[1] often shortened to biner or to crab, colloquially known as a (climbing) clip, is a specialized type of shackle, a metal loop with a spring-loaded gate^[2] used to quickly and reversibly connect components, most notably in safety-critical systems. The word comes from the German Karabiner, short for Karabinerhaken, meaning "carbine rifle hook"^[3] used by a carbine rifleman, or carabinier, to attach his carbine to a belt or bandolier.