B4, B04, B.IV or B-4 may refer to:

Transportation

Aviation

* B4, IATA code of Beond, an airline based in Malé, Maldives * B4, IATA code of B.A.C.H. Flugbetrieb, an Austrian charter airline (ICAO code BCF) * B4, IATA code of Bankair, an US American charter airline (ICAO code BKA) * B4, then-IATA code of

Flyglobespan Flyglobespan was a Scotland, Scottish low-cost airline based in Edinburgh. It operated scheduled services from five airports across Scotland, England and Ireland to destinations in Europe, North America, North Africa and South Africa. Its main ...

, a former British airline * Auster B.4, 1951 British light transport aircraft with rear ramp * Bensen B-4,

Bensen Aircraft The Bensen Aircraft Corporation was established by Dr. Igor Bensen at Raleigh-Durham International Airport in North Carolina in 1952 to develop and market a variety of helicopters and autogyros of Bensen's own design. History Their most succes ...

autogyro *

Bäumer B IV Sausewind Bäumer is a German surname. Notable people with the surname include: * Gertrud Bäumer (1873–1954), German lawyer and politician * Jens Bäumer (born 1978), German footballer * Ludwig Bäumer (1888–1928), German writer and Communist activist * ...

, German 1920s sports aircraft * Fokker B.IV, parent company's designation for American branch's F.11 seaplane * Hawker B 4, Swedish designation for Hawker Hart biplane *

Keystone B-4 The Keystone B-4 was a biplane bomber aircraft, bomber, built by the Keystone Aircraft company for the United States Army Air Corps. Design and development Originally ordered by the United States Army Air Corps as the LB-13 light bomber. When t ...

, United States biplane bomber *

Lohner B.IV The Lohner B.II (originally designated Type C) was a military reconnaissance aircraft produced in Austria-Hungary during World War I. It was a development of the pre-war B.I design, incorporating changes requested by the Austro-Hungarian army, b ...

, an Austro-Hungarian World War 1 reconnaissance biplane * Pilatus B-4, Swiss glider also designated PC-11.

Locomotives

Alsace-Lorraine B 4 The first four steam locomotives designated as Class B IX by the Royal Bavarian State Railways were procured from the locomotive works of '' Strousberg''. They were transferred in 1872 to the Imperial Railways in Alsace-Lorraine. For the remainder ...

, an Alsace-Lorraine P 1 class steam locomotive *

Bavarian B IV Bavarian B IVs were early German steam locomotives with the Royal Bavarian State Railways (''Königlich Bayerische Staatsbahn''). The six engines built by Kessler were trialled with a Kessler boiler. This had a pear-shaped cross section and coul ...

, an 1852 German steam locomotive * GSR Class B4, a former Cork, Bandon and South Coast Railway steam locomotive of the Great Southern Railways, Ireland *

LSWR B4 class The London and South Western Railway B4 class is a class of 0-4-0 tank engines originally designed for station piloting and Dock shunter, dock shunting. They were later used extensively in Port of Southampton, Southampton Docks for nearly half ...

, an 1891 British dock tank locomotive *

PRR B4 PRR may refer to: * Parietal reach region, of the human brain * Pattern recognition receptor, receptors of the innate immune system that identify pathogen-associated molecular patterns * Pennsylvania Railroad (reporting mark), an American railroad ...

, an American

Pennsylvania Railroad The Pennsylvania Railroad ( reporting mark PRR), legal name as the Pennsylvania Railroad Company, also known as the "Pennsy," was an American Class I railroad that was established in 1846 and headquartered in Philadelphia, Pennsylvania. At its ...

steam locomotive *

Soo Line B-4 class The Soo Line B-4 class were 0-6-0 steam locomotives constructed for the Minneapolis, St. Paul and Sault Ste. Marie Railway (Soo Line) by the American Locomotive Company. Six (#344–349) were built at their Schenectady plant in 1915, with a furth ...

, an American 0-6-0 steam locomotive *

LB&SCR B4 class } The B4 class were 4-4-0 steam locomotives for express passenger work on the London, Brighton and South Coast Railway. They were designed by R. J. Billinton and were either built at Brighton works 1899–1902 or else by Messrs Sharp, Stewart and ...

, a British tender locomotive class * LNER Class B4, a British class of locomotives

Automotive uses

* Subaru B4, the name under which the

Subaru Legacy The is a mid-size car built by Japanese automobile manufacturer Subaru from 1989 to 2025. The maker's flagship car, it is unique in its class for offering all-wheel drive as a standard feature, and Subaru's traditional boxer engine. The Leg ...

is marketed in Israel *

B4 (New York City bus) The Metropolitan Transportation Authority (MTA) operates a number of bus routes in Brooklyn, New York, United States; one minor route is privately operated under a city franchise. Many of them are the direct descendants of streetcar lines (see ...

, serving Brooklyn *

B4 road (Namibia) B4 is a national highway of Namibia. It passes through the ǁKaras Region of Namibia in the south-west in a west–east direction for , connecting Lüderitz on the coast to Keetmanshoop. The B4 crosses the '' Sperrgebiet'', an area restricted fo ...

Bundesstraße 4 The Bundesstraße 4 (abbr. B4) is a German federal highway running in a northwesterly to southerly direction from the state of Schleswig-Holstein to Bavaria. It provides a direct route for motorists traveling between Hamburg and Nuremberg. Th ...

, federal highway in Germany *

Alpina B4 The Alpina B4 and Alpina D4 are high-performance compact executive cars manufactured by the German automobile manufacturer, Alpina. Based on the BMW 4 Series, the B4 and D4 are manufactured in coupé and convertible body styles. The first generati ...

, a German sports executive car

In the military

* HMS ''B4'', a British B-class submarine of the Royal Navy *

, a United States Army Air Corps biplane bomber * SM ''UB-4'', a 1915 German U-boat * 203-mm howitzer M1931 (B-4, "Stalins Hammer"), a World War II Soviet ordnance piece * B-4 a US Air Force/USAAF

flight bag A flight bag can refer to any baggage taken on board a flight, but usually refers to a specific type of document bag carried by pilots and flight crews. Often adorned with an airline logo, at one time the flight bag was a chic fashion accessory. ...

* A level of

vehicle armour Military vehicles are commonly armoured (or armored; American and British English spelling differences#-our, -or, see spelling differences) to withstand the impact of Fragmentation (weaponry), shrapnel, bullets, Shell (projectile), shells, Rocke ...

In science

Leukotriene B4 receptor The leukotriene B4 receptors (BLTRs) include the following two receptor Receptor may refer to: * Sensory receptor, in physiology, any neurite structure that, on receiving environmental stimuli, produces an informative nerve impulse *Receptor (bio ...

and Leukotriene B4 receptor 2, two human genes *

Lipoxin B4 A lipoxin (LX or Lx), an acronym for lipoxygenase interaction product, is a bioactive autacoid metabolite of arachidonic acid made by various cell types. They are categorized as nonclassic eicosanoids and members of the specialized pro-resolving ...

, a lipoxin *

Proanthocyanidin B4 Procyanidin B4 is a B type proanthocyanidin. Procyanidin-B4 is a catechin-(4α→8)-epicatechin dimer. It is found in the litchi pericarp, in grape seeds, and, along with 4-cis-isomer of procyanidin B4, in beer.

, a B type proanthocyanidin *

Vitamin B4 Vitamin B4 is a former designation given to several distinct chemical compounds, none of which is currently considered a true vitamin: * Choline is synthesized by the human body, but not sufficiently to maintain good health, and is now considered ...

, an alternate name for adenine * A

stellar classification In astronomy, stellar classification is the classification of stars based on their stellar spectrum, spectral characteristics. Electromagnetic radiation from the star is analyzed by splitting it with a Prism (optics), prism or diffraction gratin ...

In entertainment

* ''B4'' (music show), a defunct British music video show broadcast on Channel 4 *

B4 (TV channel) Flava was a British hip-hop music television channel owned by Sony Pictures Television. Launched in June 2004 as B4 TV by CSC Media Group, Flava broadcast hip-hop, urban, and R&B music from the late 1970s to the 2010s. It also occasionally air ...

, a defunct British music television channel *

B-4 (Star Trek) B4, B04, B.IV or B-4 may refer to: Transportation Aviation * B4, IATA code of Beond, an airline based in Malé, Maldives * B4, IATA code of B.A.C.H. Flugbetrieb, an Austrian charter airline (ICAO code BCF) * B4, IATA code of Bankair, an US Americ ...

, an android in the ''Star Trek'' fictional universe *

Babylon 4 ''Babylon 5'' is an American space opera television series created by writer and producer J. Michael Straczynski, under the Babylonian Productions label, in association with Straczynski's Synthetic Worlds Ltd. and Warner Bros. Domestic Telev ...

space station, predecessor to Babylon 5 from the ''Babylon 5'' television series * The Lost City (B4), a ''Dungeons & Dragons'' adventure module

Other uses

B4 (classification) B4 is a blind sport classification used in a variety of sports including sailing, bowls, swimming, and cycling. Unlike other blind sport classes, it only uses visual acuity for the purpose of being classed into it. Definition This is a medical cl ...

, a parasports classification for visually impaired athletes * B4 ''Street Fighter'' Championships, a 2000 fighting game tournament * B4 or B4 II, a

Native Instruments Native Instruments is a German company that develops, manufactures, and supplies music software and hardware for music production, sound design, performance, and DJing. The company's corporate headquarters and main development facilities are lo ...

virtual synthesizer for Hammond organ (B-3) sound emulation *

B4-mount The B4 lens mount was standardized in 1992 by the Broadcasting Technology Association (BTA) and is defined in BTA S-1005. This standard defines the physical mount, but also optical properties and some electrical connections. The B4 mount defines ...

, used for professional video cameras such as Betacam * An international standard

paper size Paper size refers to Technical standard, standardized dimensions for sheets of paper used globally in stationery, printing, and technical drawing. Most countries adhere to the ISO 216 standard, which includes the widely recognized A series ( ...

(250×353 mm), defined in ISO 216 * B04,

Alekhine's Defence Alekhine's Defence is a chess opening that begins with the moves: :1. e4 Nf6 Black tempts White's pawns forward to form a broad , with plans to undermine and attack the white structure later in the spirit of hypermodern defence. White's imposi ...

chess code * 1. b4,

Sokolsky Opening The Sokolsky Opening, also known as the Orangutan and the Polish Opening, is an uncommon chess opening that begins with the move: : 1. b4 According to various databases, out of the twenty possible first moves from White, the move 1.b4 ranks ni ...

in chess