D1, D01, D.I, D.1 or D-1 can refer to:

Science and technology

Biochemistry and medicine

* ATC code D01 ''Antifungals for dermatological use'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Dopamine receptor D₁, a protein *

Haplogroup D1 (Y-DNA) Haplogroup D1 or D-M174 is a subclade of Haplogroup D-CTS3946. This male haplogroup is found primarily in East Asia and the Andaman Islands, though it is also found regularly with low frequency in Central Asia and Mainland Southeast Asia. It's also ...

* Vitamin D₁, a form of

Vitamin D Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and many other biological effects. In humans, the most important compounds in this group are vitamin D3 ...

* DI,

Iodothyronine deiodinase Iodothyronine deiodinases ( and ) are a subfamily of deiodinase enzymes important in the activation and deactivation of thyroid hormones. Thyroxine (T4), the precursor of 3,5,3'-triiodothyronine (T3) is transformed into T3 by deiodinase activity ...

type I, an enzyme involved with thyroid hormones

Technology

Nikon D1 The Nikon D1 is a digital single-lens reflex camera (DSLR) made by Nikon Corporation introduced on June 15, 1999. It featured a 2.7-megapixel image sensor, 4.5-frames-per-second continuous shooting, and accepted the full range of Nikon F-mount le ...

, a digital single-lens reflex camera * D1, former brand of

T-Mobile T-Mobile is the brand name used by some of the mobile communications subsidiaries of the German telecommunications company Deutsche Telekom AG in the Czech Republic ( T-Mobile Czech Republic), Poland ( T-Mobile Polska), the United States ( T-Mob ...

in Germany * D1, an abbreviation for DOCSIS 1.0 1.0, an international telecommunications standard *

D-1 (Sony) D-1 or 4:2:2 Component Digital is an SMPTE digital recording video standard, introduced in 1986 through efforts by SMPTE engineering committees. It started as a Sony and Bosch - BTS product and was the first major professional digital video ...

, an early digital video recording format *

STS-61-A STS-61-A (also known as Spacelab D-1) was the 22nd mission of NASA's Space Shuttle program. It was a scientific Spacelab mission, funded and directed by West Germany – hence the non-NASA designation of D-1 (for Deutschland-1). STS-61-A was th ...

, also known as D-1, the 22nd mission of NASA's Space Shuttle program * D-1, from the

Proton (rocket family) Proton (Russian: Протон) (formal designation: UR-500) is an expendable launch system used for both commercial and Russian government space launches. The first Proton rocket was launched in 1965. Modern versions of the launch system are sti ...

, Russian rockets * Mercedes D.I, a 1913 German aircraft engine

Military

World War I fighter aircraft

AEG D.I The AEG D.I was a biplane fighter of World War I. Three prototypes were ordered, but after the first two were involved in serious crashes, one of which killed flying ace Walter Höhndorf on September 5, 1917, development was cancelled. A triplan ...

* Albatros D.I * Halberstadt D.I, experimental version of Halberstadt D.II (and Aviatik D.I variant) * Aviatik (Berg) D.I *

Daimler D.I The Daimler D.I (also known by the company designation L6) was a German fighter aircraft of World War I. It was a conventional biplane design with a very small interplane gap - the top wing nearly touched the top of the fuselage. Power was prov ...

Deutsche Flugzeug-Werke Deutsche Flugzeug-Werke, usually known as DFW, was a German aircraft manufacturer of the early twentieth century. It was established by Bernhard Meyer and Erich Thiele at Lindenthal in 1910, and initially produced Farman designs under licence, lat ...

D.I * Euler D.I *

Flugzeugbau Friedrichshafen Flugzeugbau Friedrichshafen GmbH was a German aircraft manufacturing company. Overview The company was founded in 1912 in Friedrichshafen, Germany by Theodor Kober who had previously worked for the Zeppelin company. The town, which is located by ...

D.I * Fokker D.I * Hansa-Brandenburg D.I * Junkers D.I * Knoller D.I, an

Imperial and Royal Aviation Troops The Austro-Hungarian Aviation Troops or Imperial and Royal Aviation Troops (german: Kaiserliche und Königliche Luftfahrtruppen or , hu, Császári és Királyi Légjárócsapatok) were the air force of the Austro-Hungarian Empire until the e ...

aircraft * Phönix D.I *

Schütte-Lanz D.I The Schütte-Lanz D.I was a German single-seat biplane fighter, often said to be Germany's first biplane attack aircraft. The D.I was light-weight and made of wood covered in fabric, apparently based on the British design of the Sopwith Tabloid. ...

Siemens-Schuckert D.I The Siemens-Schuckert D.I was a single-seat fighter built by Siemens-Schuckert Werke in 1916. It was a German copy of the French Nieuport 17 that was obsolete by the time it was available in numbers, so that it served mainly as an advanced trainer ...

WKF D.I The WFK D.I (series 85) was a fighter aircraft built in Austria-Hungary in the final months of World War I. Operational history The KuKLFT placed an order for 48 D.Is. However, only two aircraft were delivered by the time of the Armistice, and ...

, an

aircraft

Other uses in military

Char D1 The Char D1 was an Interwar French light tank. The French plan of 1926, calling for the creation of a Light Infantry Support Tank, led to the development of the existing Renault NC1 prototype into the Char D1. One hundred and sixty vehicles of th ...

, a 1930s French tank * Dewoitine D.1, a 1920s French single-seat fighter aircraft * Dunne D.1, a 1907 British experimental aircraft * 152 mm howitzer M1943 (D-1), a Soviet World War II artillery system * , British early 20th century submarine * , a 1909 American submarine

Transportation

Locomotives and trams

* D1-class, a variant of

D-class Melbourne tram The D-class Melbourne tram is a fleet of low-floor Combino trams that operate on the Melbourne tram network. They were built by Siemens in Uerdingen, Krefeld, Germany, and are divided into two classes: the three section D1-class which was ...

* D1 multiple unit, a train built in 1960s-1980s in Hungary for Soviet railways * LB&SCR D1 class, an 1873 British tank locomotive * NCC Class D1, a

Northern Counties Committee The Northern Counties Committee (NCC) was a railway that served the north-east of Ireland. It was built to Irish gauge () but later acquired a number of narrow gauge lines. It had its origins in the Belfast and Ballymena Railway that opened to ...

Irish gauge steam locomotive * Pennsylvania Railroad class D1, an 1868 American steam locomotive *

Bavarian D I Class D I of the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn'') was a tank locomotive with two coupled axles designed for shunting. As had been specified, these locomotives were simple and robust. They had a double-frame, ...

, an 1871 Bavarian tank locomotive * Min'an Electric D01, a sports luxury vehicle

Roads

* D1 road (Croatia) *

D1 motorway (Czech Republic) The D1 highway ( cs, Dálnice D1) is the main highway of the Czech Republic. Currently it connects the two biggest Czech cities, Prague and Brno; in the future it will be extended to Ostrava and to the Czech–Polish border in Věřňovice (Ka ...

* D1 motorway (Slovakia)

Other uses in transportation

* D1, a model of

BSA Bantam The BSA Bantam is a two-stroke unit construction motorcycle that was produced by the Birmingham Small Arms Company (BSA) from 1948 (as a 125 cc) until 1971 (as a 175 cc). Exact production figures are unknown, but it was over 250,00 ...

British motorcycle * D1, a commuter rail line of

Moscow Central Diameters The Moscow Central Diameters (MCD) (russian: links=no, Московские центральные диаметры (МЦД), Moskovskiye tsentralnye diametry (MTsD)) are a system of city train services on existing commuter rail lines in Moscow an ...

* D1 Denby Darts, a bus service in Yorkshire, UK * BYD D1, an electric multi purpose vehicle (MPV)

Sports

NCAA Division I NCAA Division I (D-I) is the highest level of intercollegiate athletics sanctioned by the National Collegiate Athletic Association (NCAA) in the United States, which accepts players globally. D-I schools include the major collegiate athleti ...

, D-I, the highest division of American collegiate athletics *

D1 Grand Prix The , abbreviated as D1GP and subtitled ''Professional Drift'', is a production car drifting series from Japan. After several years of hosting amateur drifting contests, Daijiro Inada, founder of '' Option'' magazine and Tokyo Auto Salon, and d ...

, a production car drifting series from Japan * D1NZ, a production car drifting series in New Zealand

Other uses

* D1 (building), a residential building in Dubai * D1 (Longs Peak), a technical climbing route in Colorado, U.S. * D1, a Dublin postal district * D1, a guitar model by C. F. Martin & Company * D1, a code in

Town and country planning in the United Kingdom Town and country planning in the United Kingdom is the part of English land law which concerns land use planning. Its goal is to ensure sustainable economic development and a better environment. Each country of the United Kingdom has its own p ...

* D1, a transmittered juvenile female bald eagle from the 2011 clutch of the Decorah Bald Eagles *D1, a

discount store A discount store or discounter offers a retail format in which products are sold at prices that are in principle lower than an actual or supposed "full retail price". Discounters rely on bulk purchasing and efficient distribution to keep down cos ...

chain from Colombia. * D-1 visa, a non-immigrant U.S. visa * "D-1", a song from ''Yves'' (single) by Loona *

D1 Recordings D1 Recordings is an Irish independent techno record label founded in 1994 by Eamonn Doyle. It is named after the Dublin postcode in which it was located and has released music by artists from there and elsewhere. Ian Maleney wrote in ''The Irish ...

, an Irish independent techno record label * D01, ECO code for the Richter-Veresov Attack chess opening *

Digital One Digital One is a national commercial digital radio multiplex in the United Kingdom, owned by Arqiva. , the multiplex covered more than 90% of the population from 137 transmitters. Coverage was extended to Northern Ireland in July 2013. It cont ...

- also known as D1 National, a digital radio multiplex in the United Kingdom