D4

D4, D04, D.IV, D IV, D.4 or D-4 may mean:

• 22-Dihydroergocalciferol, vitamin D₄
• D4 framing standard, a framing standard for traditional time-division multiplexing
• D4 Princess, a 1999 Japanese manga series
• D4 (programming language), a programming language of the Dataphor system
• D4 video connector, a type of analog video connector found on Japanese consumer electronics
• Albatros D.IV, a World War I experimental German fighter aircraft
• ATC code D04 Antipruritics, including antihistamines, anesthetics, etc., a subgroup of the Anatomical Therapeutic Chemical Classification System
• Auster D.4, a 1960 two-seat British light aircraft
• Bavarian D IV, a 1878 German tank locomotive model
• Bavarian D IV (Ostbahn), a 1867 German steam locomotive model
• Caterpillar D4 a Small crawler type tractor built by Caterpillar Inc.
• Dewoitine D.4, a Dewoitine aircraft
• Dopamine receptor D4, a human gene
• Dunne D.4, a 1907 British experimental aircraft
• Fokker D.IV, a World War I German fighter biplane
• GSWRI Class D4, a Great Southern and Western Railway Irish steam locomotive
• HMAS Voyager (D04), a 1949 Daring class Australian Navy destroyer
• LFG Roland D.VI, an aircraft powered by the German Mercedes D.III engine
• Mercedes D.IV, a World War I German 8-cylinder, liquid-cooled inline aircraft engine
• Mercedes D.IVa, a 1917 German 6-cylinder, water-cooled, inline aircraft engine
• Motorway D4 (Slovakia), a motorway in southwestern Slovakia
• Phönix D.IV, a KuKLFT D-class designation aircraft
• PRR D4, a 1873 American steam locomotive model
• Schütte-Lanz D.IV, a 1917 German fighter prototype aircraft
• Siemens-Schuckert D.IV, a 1918 German fighter aircraft
• SP&S Class D-4, a steam locomotives class
• The D4, a rock band from Auckland, New Zealand

Also:

• Dillinger Four, a punk rock band from Minneapolis, Minnesota.
• Driver: Parallel Lines, the fourth videogame in the Driver series
• Dublin 4, a Dublin postcode
• d4, a 4-sided die
• 1. d4, the second most popular opening move in chess and begins the Queen's Pawn Game
• Alidaunia IATA code
• A model of tractor made by Caterpillar, Inc.
• The symmetry group of a square - Examples of groups
• D04 : Carcinoma in situ of skin ICD-10 code

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