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left to right: horizontal, tubular, and ring wafer pitons
A metal spike fitted at one end with an eye for securing a rope and driven into rock or ice as a support in mountain climbing.
[French, from Old French, nail.]
piton(ˈpiːtɒn; French pitɔ̃)
(Mountaineering) mountaineering a metal spike that may be driven into a crevice of rock or into ice and used to secure a rope
[C20: from French: ringbolt]
a metal spike with an eye through which a rope may be passed in mountain climbing.
[1895–1900; < French: ringbolt]