set piece

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

• noun A realistic piece of stage scenery constructed to stand by itself.
• noun An often brilliantly executed artistic or literary work characterized by a formal pattern.
• noun A carefully planned and executed military operation.
• noun A situation, activity, or speech planned beforehand and carried out according to a prescribed pattern or formula.

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

• noun a piece of freestanding stage scenery
• noun any carefully planned sequence of operations, especially as part of a military operation
• noun an elaborate action scene in a movie or video game
• noun soccer any planned strategy that a team uses after play is restarted with a free kick, penalty kick, corner kick, goal kick, throw-in or kickoff.

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

• noun a piece of scenery intended to stand alone as part of the stage setting