An ice ax.
ice ax definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an axlike mountain-climbing tool having a pick and an adz at opposite ends of the head, and a spike at the bottom of the handle
ice ax definition by American Heritage Dictionary
A pickax having a sharp point or spike at the bottom of the handle, used by mountaineers for climbing on ice. Also called piolet.