Then I couldn't get out a piton Haas had hammered into a crack.
From the timesunion.com
While he was hammering a piton into the rock, a large section of the cliff sheared off from the mountain face, carrying him with it.
From the en.wikipedia.org
Also there you can find all sorts of barbaric things like taking bile from a live Bear, dust from tiger bones, blood from piton snakes, etc.
From the guardian.co.uk
Soft pitons are difficult to remove without damaging the piton, so they were frequently left in place, and became fixed anchor points on a climb.
From the en.wikipedia.org
More examples
A metal spike with a hole for a rope; mountaineers drive it into ice or rock to use as a hold
In climbing, a piton (pronounced Pee'-ton, also called a pin or peg) is a metal spike (usually steel) that is driven into a crack or seam in the rock with a hammer, and which acts as an anchor to protect the climber against the consequences of a fall, or to assist progress in aid climbing. ...
The Pitons are two volcanic plugs in a World Heritage Site in Saint Lucia. The Gros Piton is 771 m, and the Petit Piton is 743 m high; they are linked by the Piton Mitan ridge.
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
(Pitons) Steel wedges or blades hammered into cracks to protect or anchor climbers. Once the only form of protection, pitons have been supplanted by easily removable protection such as nuts, because repeated placement and removal of pitons damaged the rock. ...
A thin, wedge like piece of metal that is pounded into a rock face and then clipped to the climbing rope for protection. The original means of protecting climbs, now out of favor because of the damage it does to the rock.
N. a long-nosed, spike shaped, piece of metal driven into cracks for protection or aid.
Metal loop climbers screw into rock to run rope through for safety.
[Fr.] A metal spike designed to be hammered into rock (or screwed into ice), with a loop for passing a rope through. Prohibited in most places in the East, because they permanently alter the rock. (Different rules apply for ice climbing.)