home base

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

• noun An objective toward which players of certain games, such as backgammon, progress.
• noun Baseball Home plate.
• noun A base of operations; a headquarters.

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

• noun baseball Home plate.
• noun business Headquarters.

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

• noun (usually plural) the office that serves as the administrative center of an enterprise
• noun (baseball) base consisting of a rubber slab where the batter stands; it must be touched by a base runner in order to score