piton

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.

A point; a peak.

A metal spike having a sharpened point on one end, and a hole through which a rope can be passed on the other; it is driven into the face of a rock cliff during climbing, and used as an anchor point for a rope.

a spike, wedge, or peg that is driven into a rock or ice surface as a support (as for a mountain climber)

to put pitons into a rock/ice to facilitate climbing

a metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold