- the polestar or North Star, a star of the second magnitude situated close to the north pole of the heavens, in the constellation Ursa Minor: the outermost star in the handle of the Little Dipper.
- a two-stage U.S. ballistic missile, usually fired from a submerged submarine.
- the brightest star in the constellation Ursa Minor, situated slightly less than 1° from the north celestial pole. It is a Cepheid variable, with a period of four days. Visual magnitude: 2.08–2.17; spectral type: F8Ib
- a type of US two-stage intermediate-range ballistic missile, usually fired by a submerged submarine
- (as modifier)
