Categories: Disambiguation In geometry, a pentagon is any five-sided polygon. ... Wiktionary has a definition of: Polygon A polygon (literally many angle, see Wiktionary for the etymology) is a closed planar path composed of a finite number of sequential line segments. ... The Pentagon home computer, manufactured in former Soviet Union, is a clone of the British-made Sinclair ZX Spectrum 128. ... The Sinclair ZX Spectrum was a small home computer released in the United Kingdom in 1982 by Sinclair Research. ... The Pentagon, looking east with the Potomac River and Washington Monument in the distance. ... The United States Department of Defense, abbreviated as DoD or DOD and sometimes called the Defense Department, is a civilian Cabinet organization of the United States government. ... Arlington County is a county located in the U.S. state of Virginia, directly across the Potomac River from Washington, DC. Originally part of the District of Columbia, by an act of Congress July 9, 1846, the area south of the Potomac was returned (retroceded) to Virginia effective in 1847. ... A chess engine is a computer program that can play the game of chess, it can also refer not just to a program, but to a whole hardware machine. ... In 1997, Chrysler Corporation and Rover Group (later BMW) formed Tritec, a joint venture to design a new small straight-4 engine for small cars. ... A small variety of cars, the most popular kind of automobile. ...