This long, naturally formed branch of wood is called a shillelagh (shil-AY-lee). A shillelagh is an Irish tool which functions as a walking stick, dueling weapon, and club all in one. They are designed to be lightweight for walking, but sturdy enough to withstand a duel. Shillelaghs are polished from one solid piece of wood. Owners hold onto the straight end and strike with the hooked knob.