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D4, D.IV, d4 or variants may refer to: ;Science and medicine * 22-Dihydroergocalciferol, vitamin D4 * D4-isoprostane, a type of isoprostane * ATC code D04 ''Antipruritics, including antihistamines, anesthetics, etc.'', a subgroup of the Anatomical Therapeutic Chemical Classification System * D04 : Carcinoma in situ of skin ICD-10 code * Dopamine receptor D4, a human gene * Octamethylcyclotetrasiloxane, called D4 ;Technology and computing * D4 (programming language), a programming language of the Dataphor system * D4 video connector, a type of analog video connector found on Japanese consumer electronics * D4 framing standard, a framing standard for traditional time-division multiplexing ;Aircraft * Albatros D.IV, a World War I experimental German fighter aircraft * Auster D.4, a 1960 two-seat British light aircraft * Dewoitine D.4, a Dewoitine aircraft * Dunne D.4, a 1907 British experimental aircraft * Fokker D.IV, a World War I German fighter biplane * LFG Roland D.VI, an aircraft powered by the German Mercedes D.III engine * Phönix D.IV, a KuKLFT D-class designation aircraft * Schütte-Lanz D.IV, a 1917 German fighter prototype aircraft * Siemens-Schuckert D.IV, a 1918 German fighter aircraft ;Rail transport * Bavarian D IV, an 1878 German tank locomotive model * Bavarian D IV (Ostbahn), an 1867 German steam locomotive model * GSWRI Class D4, a Great Southern and Western Railway Irish steam locomotive * PRR D4, an 1873 American steam locomotive model * SP&S Class D-4, a steam locomotives class ;Engines * 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 ;Media and entertainment * The D4, a rock band from Auckland, New Zealand * D4 Princess, a 1999 Japanese manga series * ''D4: Dark Dreams Don't Die'' (video game), a video game by Hidetaka Suehiro for the Xbox One and PC * ''D4'' (film) by Darrin Dickerson ;Other * Nikon D4, a flagship DSLR from Nikon * Caterpillar D4 a Small crawler type tractor built by Caterpillar Inc. * HMAS Voyager (D04), a 1949 Daring class Australian Navy destroyer * Motorway D4 (Slovakia), a motorway in southwestern Slovakia * The symmetry group of a square - Examples of groups * Dublin 4, a Dublin postcode * d4, a 4-sided die * d4, the second most popular opening move in chess; begins the Queen's Pawn Game * D4 IATA code for Alidaunia airport * A model of tractor made by Caterpillar, Inc. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「D4」の詳細全文を読む スポンサード リンク
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