- a polygon having five angles and five sides.
- the Pentagon,
- a building in Arlington, Virginia, having a plan in the form of a regular pentagon, containing most U.S. Defense Department offices.
- the U.S. Department of Defense; the U.S. military establishment.
- a polygon having five sides
- the five-sided building in Arlington, Virginia, that houses the headquarters of the US Department of Defense
- the military leadership of the US
