karabiner(n = noun.artifact) carabiner, snap ring - an oblong metal ring with a spring clip; used in mountaineering to attach a rope to a piton or to connect two ropes;
is a kind of fastener, fastening, fixing, holdfast, hoop, ring

karabiner, n. a coupling link with safety closure, used by mountaineers.

Etymology:
G, lit. 'carbine'