W4

W4 may be:

• US tax form W-4
• W4, a postcode district in the W postcode area
• W4, a four cylinder internal combustion engine in W configuration
• Mark 4 nuclear bomb
• West Fourth Street – Washington Square (New York City Subway); a subway station in Manhattan serving the A B C D E F M trains
• Worms: The Director's Cut, fourth game in the Worms series
• Spear of Destiny, the fourth game in the Wolfenstein series
• Warcraft II: Battle.net Edition, the fourth game in the Warcraft series
• the fifth step of the W0-W6 scale for the classification of meteorites by weathering
• W4, a performance advertising network
• The Heart Nebula, also known as W4 (short for Westerhout 4)
• Two Michigan radio stations WDTW-FM Detroit (Using the W4 moniker from 1966 to 2000) and WWWW-FM in Ann Arbor (using the W4 moniker from 2000-Present)