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

Transportation

Aviation

* Auster B.4, 1951 British light transport aircraft with rear ramp * B.A.C.H. Flugbetriebs IATA airline designator (ICAO BCF) * Bankair IATA code, ICAO airline designator (BKA) * 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 The most success ...

autogyro * Bäumer B IV Sausewind, German 1920s sports aircraft *

Flyglobespan Flyglobespan was a low-cost airline based in Edinburgh, Scotland. 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 bases we ...

IATA airline designator * 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, 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 the ''LB-'' design ...

, United States biplane bomber * Lohner B.IV, an Austro-Hungarian World War 1 reconnaissance biplane *

Pilatus B-4 The Pilatus B4-PC11 (also known as the PC-11 in the Pilatus numbering sequence) is an all-metal intermediate glider built by Pilatus Aircraft of Switzerland. The B4-PC11 is designed to Standard Class specifications, meaning that it has a 15-met ...

, Swiss glider also designated PC-11.

Locomotives

* Alsace-Lorraine B 4, an Alsace-Lorraine P 1 class steam locomotive * Bavarian B IV, 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, an 1891 British dock tank locomotive * PRR B4, an American Pennsylvania Railroad steam locomotive * Soo Line B-4 class, an American 0-6-0 steam locomotive * LB&SCR B4 class, a British tender locomotive

Automotive uses

* Subaru B4, the name under which the

Subaru Legacy The is a mid-size car built by Japanese automobile manufacturer Subaru since 1989. 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 Legacy was sol ...

is marketed in Israel * B4 (New York City bus), 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 f ...

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

, federal highway in Germany

In the military

Handpainted Wayzata soldier's flight bag back

* 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; see spelling differences) to withstand the impact of shrapnel, bullets, shells, rockets, and missiles, protecting the personnel inside from enemy fire. Such vehicles include armoured fi ...

In science

* Leukotriene B4 receptor 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-resolvin ...

, a lipoxin * Proanthocyanidin B4, a B type proanthocyanidin * Vitamin B4, an alternate name for adenine * A stellar classification

In entertainment

* ''B4'' (music show), a defunct British music video show broadcast on Channel 4 * B4 (TV channel), a defunct British music television channel * B-4 (Star Trek), 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), 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, used for professional video cameras such as Betacam * An international standard

paper size Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size. I ...

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

Alekhine's Defence The 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 im ...

chess code * 1. b4, Sokolsky Opening in chess