W4 may refer to: * Form W-4, an American tax form *

Heart Nebula The Heart Nebula (also known as the Running dog nebula, IC 1805, Sharpless 2-190) is an emission nebula, 7500 light years away from Earth and located in the Perseus Arm of the Galaxy in the constellation Cassiopeia. It was discovered by William ...

or Westerhout 4, an interstellar cloud in Cassiopeia *

London W4 The W (Western and Paddington) postcode area, also known as the London W postcode area is a group of postcode districts covering part of central and part of West London, England. The area originates from the Western (W1) and Paddington (W2-14) ...

, a postcode district in west London, England *

W4 (nuclear warhead) The Mark 4 nuclear bomb was an American implosion-type nuclear bomb based on the earlier Mark 3 Fat Man design, used in the Trinity test and the bombing of Nagasaki. With the Mark 3 needing each individual component to be hand-assembled by only h ...

, a planned variant of the 1949–1953 Mark 4 nuclear bomb * W4, complete oxidation of metal, a degree of meteorite weathering * WLLZ (FM), a radio station in Detroit, USA, known as W4 from 1966 to 2000 *

WWWW-FM WWWW-FM (''W4 Country''), is a country music radio station based in Ann Arbor, Michigan, broadcasting on 102.9 MHz. Owned by Cumulus Media, WWWW-FM has a transmitter at its studios off of South Wagner Road to the northwest of downtown Ann Arbor ...

or W4 Country, a country music radio station in Ann Arbor, USA *

LC Perú LC Perú S.A.C. was a Peruvian airline based in Lima, Peru. It operated scheduled domestic flights. Its main base was Jorge Chávez International Airport.. History The company was founded in 1993, they started operations as a cargo agent. In 199 ...

, a Peruvian airline (IATA airline designator W4) *

Warwick W-4 Hot Canary The W-4 Hot Canary is a custom biplane designed for air racing. Design The W-4 is a single place conventional geared negative stagger biplane. Operational history *1970 Florida Sport Biplane consolation race - 1st place *1970 Reno Air Race ...

, a racing biplane * W4 tram, a class of electric trams built by the Melbourne & Metropolitan Tramways Board.

See also