D4 (other)
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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 D04A Antipruritics, including antihistamines, anesthetics, etc. D04AA Antihistamines for topical use :D04AA01 Thonzylamine :D04AA02 Mepyramine :D04AA03 Thenalidine :D04AA04 Tripelennamine :D04AA09 Chloropyramine :D04AA10 Promethazine :D04AA12 Tol ...
, ''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 The dopamine receptor D4 is a dopamine D2-like G protein-coupled receptor encoded by the gene on chromosome 11 at 11p15.5. The structure of DRD4 was recently reported in complex with the antipsychotic drug nemonapride. As with other dopamine ...
, a human gene *
Octamethylcyclotetrasiloxane Octamethylcyclotetrasiloxane, also called D4, is an organosilicon compound with the formula . It is a colorless viscous liquid. It is a common cyclomethicone. It is widely used in cosmetics. Production and polymerization Commercially D4 is prod ...
, called D4


Mathematics

* Dihedral group of order 4, otherwise known as the
Klein four-group In mathematics, the Klein four-group is a Group (mathematics), group with four elements, in which each element is Involution (mathematics), self-inverse (composing it with itself produces the identity) and in which composing any two of the three ...
*
Dihedral group of order 8 Some elementary examples of groups in mathematics are given on Group (mathematics). Further examples are listed here. Permutations of a set of three elements Consider three colored blocks (red, green, and blue), initially placed in the order R ...
, the symmetry group of a regular 4-gon * D4 (root system)


Technology and computing

*
D4 (programming language) Dataphor is an open-source truly- relational database management system ( RDBMS) and its accompanying user interface technologies, which together are designed to provide highly declarative software application development. The Dataphor Server has ...
, a programming language of the Dataphor system * D4 video connector, a type of analog video connector found on Japanese consumer electronics *
D4 framing standard In telecommunications, superframe (SF) is a T1 framing standard. In the 1970s it replaced the original T1/D1 framing scheme of the 1960s in which the framing bit simply alternated between 0 and 1. Superframe is sometimes called D4 Framing to a ...
, 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 Constructions Aéronautiques Émile Dewoitine was a French aircraft manufacturer established by Émile Dewoitine at Toulouse in October 1920. The company's initial products were a range of metal parasol-wing fighters which were largely ignored by th ...
aircraft * Dunne D.4, a 1907 British experimental aircraft * Fokker D.IV, a World War I German fighter biplane *
LFG Roland D.VI The Roland D.VI was a German fighter aircraft built at the end of World War I. It lost a fly-off to the Fokker D.VII, but production went ahead anyway as insurance against problems with the Fokker. Design and development The Roland D.VI was des ...
, an aircraft powered by the German
Mercedes D.III The Mercedes D.III, or F1466 as it was known internally, was a six-cylinder SOHC valvetrain liquid-cooled inline aircraft engine built by Daimler and used on a wide variety of German aircraft during World War I. The initial versions were introd ...
engine * Phönix D.IV, a KuKLFT D-class designation aircraft * Schütte-Lanz D.IV, a 1917 German fighter prototype aircraft *
Siemens-Schuckert D.IV The Siemens-Schuckert D.IV was a late-World War I fighter aircraft from Siemens-Schuckert (SSW). It reached service too late and was produced in too few numbers to have any effect on the war effort. Earlier designs Siemens-Schuckert's first prod ...
, a 1918 German fighter aircraft


Transport


Rail

* Bavarian D IV, an 1878 German tank locomotive model * Bavarian D IV (Ostbahn), an 1867 German steam locomotive model * D4, the tank engine variant of the Victorian Railways Dd class locomotive in Australia * GSWRI Class D4, a Great Southern and Western Railway Irish steam locomotive * LNER Class D4, a class of British steam locomotives * PRR D4, an 1873 American steam locomotive model * SP&S Class D-4, a Spokane, Portland and Seattle Railway locomotive


Road

*
D4 motorway (Czech Republic) D4 motorway ( cs, Dálnice D4), formerly Expressway R4 ( cs, Rychlostní silnice R4) is a highway in the Czech Republic, southwest from Prague. Sections of the motorway: Unfinished sections Images File: R4 near Voznice (1).jpg , Highway D ...
, a motorway in the Czech Republic * D4 motorway (Slovakia), a motorway in Slovakia


Engines

* Mercedes D.IV, a World War I German 8-cylinder, liquid-cooled inline aircraft engine *
Mercedes D.IVa The Mercedes D.IVa was a German six-cylinder, water-cooled, inline engine developed in 1917 for use in aircraft and built by ''Daimler Motoren Gesellschaft'' (DMG).Gunston 1989, p.101. Design and development The D.IVa replaced the failed Merc ...
, a 1917 German 6-cylinder, water-cooled, inline aircraft engine


Media and entertainment

*
The D4 The D4 was a rock band from Auckland, New Zealand. Their music was released by Hollywood Records in the U.S., Flying Nun Records in New Zealand and by Infectious Records in the UK. The group was assembled by vocalist/ guitarists Dion Palmer ...
, a rock band from Auckland, New Zealand * ''
D4 Princess is a manga series created by . The story was adapted into an anime series. The anime is composed of 24 thirteen-minute episodes and is part of the anime program ''Anime Complex, Anime Complex II''; it ran from April 6 to September 28, 1999. ...
'', a 1999 Japanese manga series * '' D4: Dark Dreams Don't Die'', a video game by Hidetaka Suehiro for the Xbox One and PC * ''D4'' (film), by Darrin Dickerson * ''
D4 - Get Up and Dance ''D4 - Get Up and Dance'' is an Indian dance fiction television series that premiered on Channel India on February 22, 2016.Diablo IV ''Diablo IV'' is an upcoming action role-playing game developed and published by Blizzard Entertainment, and is the fourth main installment in the '' Diablo'' series. The game was announced on November 1, 2019 at BlizzCon 2019, and is scheduled ...
'', an upcoming action role-playing game by Blizzard Entertainment


Other uses

*
Nikon D4 The Nikon D4 is a 16.2-megapixel professional-grade full frame (35mm) digital single-lens reflex camera (DSLR) announced by Nikon Corporation on 6 January 2012. It succeeds the Nikon D3S and introduces a number of improvements including a 16.2 ...
, a flagship DSLR from Nikon *
Caterpillar D4 The Caterpillar D4 track-type tractor is a small bulldozer manufactured by Caterpillar Inc. Caterpillar first introduced the RD4 in 1936 as the diesel follow on to the successful CAT 30 gas model. The RD4 originally weighed in at , and used Cat ...
a small crawler type tractor built by Caterpillar Inc. * , a 1949 Australian Navy destroyer * , a 1911 British submarine * Motorway D4 (Slovakia), a motorway in southwestern Slovakia *
Peugeot D4 The Peugeot D3 and its successor, the Peugeot D4 were forward control panel vans sold by Peugeot from October 1950 till 1965. The van originated as a front wheel drive light van produced by Chenard-Walcker, whose business Peugeot had acquired by 1 ...
, a French van sold between 1955 and 1965 *
Dublin 4 Dublin 4, also rendered as D4 and D04, is a historic postal district of Dublin, Ireland including Baggot Street Upper, the southernmost fringes of the Dublin Docklands, and the suburbs of Ballsbridge, Donnybrook, Irishtown, Merrion, Ringsend ...
, a Dublin postcode * d4, a
4-sided die Four-sided dice, abbreviated d4, are often used in tabletop role-playing games to obtain random integers in the range 1–4. Three forms exist of this die: a tetrahedron (pyramid shape) with four equilateral triangle-shaped faces, a rectangular pr ...
* d4, the second most popular opening move in chess; begins the
Queen's Pawn Game Queen's Pawn Game broadly refers to any chess opening starting with the move 1.d4, which is the second most popular opening move after 1.e4 ( King's Pawn Game). Terminology The term "Queen's Pawn Game" is usually used to describe openings begi ...
* D4, IATA code for
Alidaunia Alidaunia S.r.L. is an Italian airline based in Foggia. It operates scheduled passenger services, air ambulance, air taxi/charter, offshore, aircraft maintenance, flying school and aerial work services. Its main base is Gino Lisa Airport, Foggia ...
airline * D4, commonly used jargon by fans for Ddu-Du Ddu-Du, a song produced by K-Pop group Blackpink.


See also

*
Div (disambiguation) Div or DIV may refer to: Science and technology * Division (mathematics), the mathematical operation that is the inverse of multiplication * Span and div, HTML tags that implement generic elements * div, a C mathematical function * Divergence, a ...
{{Letter-Number Combination Disambiguation