Chockstone - Rock or stone tightly wedged in a crack. Originally used for climbing protection by girth-hitching a runner around it and clipping the rope in. Precursors to metal chocks.

• 紧密地楔入岩缝的岩石。原先在这样的岩石上缠绕扁带，被用做攀登保护点。金属物的前身。