A PITON is a metal spike that is used by climbers to secure themselves to a rock face. It is also known as a climber's spike, and is typically made of steel or aluminum. The word 'PITON' comes from the French word for 'PEG'. Pitons are inserted into cracks in the rock and then secured with a carabiner or other climbing equipment. They provide a secure anchor point for the climber and can be used to ascend or descend a rock face.