horizontal bar

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

• noun A gymnastics apparatus consisting of a single bar mounted approximately eight feet above the ground and used for swinging maneuvers.

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

• noun gymnastics A horizontally-aligned bar used in gymnastics, upon which acts of swinging are performed.
• noun gymnastics A gymnastics event using the horizontal bar.
• noun typography The dash symbol (―) (used to introduce quoted text)

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

• noun gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends