shooting stick

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A stick resembling a cane, pointed at one end with a folding seat at the other, typically used by spectators at outdoor sporting events.

from The Century Dictionary.

• noun In printing, a piece of hard wood or metal, about ten inches long, which is struck by a mallet to tighten or loosen the quoins in a chase.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A walking stick that has a spike at one end, and a handle that unfolds into a simple seat; used as a short-term seat at outdoor events

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun device that resembles a spiked walking stick but the top opens into a seat