1) Footwear accessory 2) Spikes for walking on ice 
A crampon is a traction device used to improve mobility on snow and ice during ice climbing. Not only are crampons used during ice climbing, but they are also used for secure travel on snow and ice, such as crossing glaciers, snowfields and icefields, ascending snow slopes, and scaling ice-covered rock. There are three main attachment systems for ...
Spiked metal devices that attach firmly to climbing boots to provide reliable footing on ice and firm snow slopes.
There are two types of Crampons used when ski mountaineering or touring.
(from the article `mountaineering`) ...of a shaft and a spike at the other, it is used for cutting steps in ice, probing crevasses, obtaining direct aid on steep slopes, achieving ...