B3, B03, B.III or B-3 may refer to:

Military

American bombers

Keystone B-3 The Keystone B-3A was a bomber aircraft developed for the United States Army Air Corps by Keystone Aircraft in the late 1920s. Design and development The B-3 was originally ordered as the LB-10A (a single-tail modification of the Keystone LB-6) ...

, a biplane bomber of the United States Army Air Corps *

Next-Generation Bomber The Next-Generation Bomber (NGB; unofficially called 2018 Bomber) was a program to develop a new medium bomber for the United States Air Force. The NGB was initially projected to enter service around 2018 as a stealthy, subsonic, medium-range, m ...

(2018 Bomber), next bomber follow-on to the B-2 stealth bomber program *

Long Range Strike Bomber program The Long Range Strike Bomber (LRS-B) is a development and acquisition program to develop a long-range strategic bomber for the United States Air Force, intended to be a heavy-payload stealth aircraft capable of delivering thermonuclear weapons. ...

, successor program to the 2018 Bomber program ** Northrop Grumman B-21, a successor aircraft to the B-1 and B-52 bombers

German and Austro-Hungarian aircraft

* AEG B.III, a German reconnaissance aircraft * Albatros B.III, a German Idflieg B-class designation aircraft * Aviatik B.III, a 1916 Austro-Hungarian reconnaissance aircraft * Euler B.III, a German Idflieg B-class designation aircraft * Fokker B.III (disambiguation), two aircraft models * Halberstadt B.III, a German Idflieg B-class designation aircraft *

Kampfgeschwader 54 ''Kampfgeschwader'' 54 "Totenkopf" (, KG 54) was a Luftwaffe bomber wing during World War II. It served on nearly all the fronts in the European Theatre where the German Luftwaffe operated. KG 54 was formed in May 1939. The bomber wing was equi ...

, from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II * Lohner B.III *

LVG B.III The LVG B.I was a 1910s Germany, German two-seat reconnaissance biplane designed by LVG (aircraft manufacturer), Luft-Verkehrs-Gesellschaft for the ''Luftstreitkräfte''. Development LVG had been involved in the operation of dirigibles before it ...

, a 1910s German two-seat trainer biplane

Submarines

* USS ''B-3'' (SS-12), a United States Navy submarine * HMS ''B3'', a British B class submarine of the Royal Navy

Civilian transportation

Roads

* B3 road (Kenya) *

B3 road (Namibia) B3 is a national highway of Namibia. It passes through the ǁKaras Region of Namibia in the south for , connecting the B1 at Grünau to the South African border at Nakop via the town of Karasburg. In South Africa the highway continues as the N ...

Bundesstraße 3 The Bundesstraße 3 (abbr. B3) is one of the longest federal highways in Germany. It begins in Buxtehude and continues through Bergen, Celle, Hanover, Alfeld, Einbeck, Göttingen, Kassel, Marburg, Frankfurt am Main, Darmstadt, Heidelberg, ...

, a German national highway

Trains

* Alsace-Lorraine B 3, an

Alsace-Lorraine P 1 The Imperial German railways (''Reichseisenbahnen'') allocated various steam locomotives in Alsace-Lorraine to the P 1 class of engines as follows: ;Classification system from 1906/1912 *Alsace-Lorraine B 1 *Alsace-Lorraine B 2 *Alsace-Lorraine B 3 ...

class steam locomotive * Bavarian B III, an 1852 German steam locomotive model *

NCC Class B3 The LMS (Northern Counties Committee) Class B3 4-4-0 passenger steam locomotives were rebuilds of Belfast and Northern Counties Railway (BNCR) two-cylinder compound locomotives. They operated services throughout the NCC's broad gauge system ...

, an 1890 Irish 4-4-0 passenger steam locomotive * NSB B3 (Class 3), Norwegian railway carriages

Other

B3 (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 l ...

serving Brooklyn *

Bellview Airlines Bellview Airlines was an airline headquartered at Bellview Plaza in Ikeja, Lagos State, Nigeria. Founded in 1992 and having had 308 employees, it operated scheduled passenger flights within Africa as well as to London out of Murtala Mohammed Int ...

(International Air Transport Association code B3)

Biology and medicine

B3 (classification) B3 is a medical based Paralympic classification for blind sport. Competitors in this classification have partial sight, with visual acuity from 2/60 to 6/60. It is used by a number of blind sports including para-alpine skiing, para-Nordic s ...

, a medical-based Paralympic disability sport classification for blind sport *

B3 domain The B3 DNA binding domain (DBD) is a highly conserved domain found exclusively in transcription factors (≥40 species) () combined with other domains (). It consists of 100-120 residues, includes seven beta strands and two alpha helices that fo ...

, a highly conserved plant DNA-binding domain *

Procyanidin B3 Procyanidin B3 is a B type proanthocyanidin. Procyanidin B3 is a catechin dimer (catechin-(4α→8)-catechin). Natural occurrences It can be found in red wine, in barley, in beer, in peach or in '' Jatropha macrantha'', the Huanarpo Macho. H ...

, a plant phenolic compound *

ATC code B03 B03A Iron preparations B03AA Iron bivalent, oral preparations :B03AA01 Ferrous glycine sulfate :B03AA02 Ferrous fumarate :B03AA03 Ferrous gluconate :B03AA04 Ferrous carbonate :B03AA05 Ferrous chloride :B03AA06 Ferrous succinate :B03AA07 Ferrou ...

''Antianemic preparations'', a subgroup of the Anatomical Therapeutic Chemical Classification System *

Prodelphinidin B3 Prodelphinidin B3 is a prodelphinidin dimer found in food products such as barley and beer, in fruits and pod vegetables. It can also be found in pomegranate The pomegranate (''Punica granatum'') is a fruit-bearing deciduous shrub in the fami ...

, a plant phenolic compound * Vitamin B₃ (niacin)

Computing

* A

TCSEC Trusted Computer System Evaluation Criteria (TCSEC) is a United States Government Department of Defense (DoD) standard that sets basic requirements for assessing the effectiveness of computer security controls built into a computer system. The TCS ...

security class in the Trusted Computer System Evaluation Criteria * "B3 Coin" a cryptocurrency

Engines

* A type of four-cylinder

Mazda B engine The Mazda B-series engine - not to be confused with the Mazda B-Series truck - is a small-sized, iron-block, inline four-cylinder with belt-driven SOHC and DOHC valvetrain ranging in displacement from 1.1 to 1.8 litres. It was used from front-wh ...

* Benz B.III, an engine powering the 1914 Friedrichshafen FF.33 German aircraft

Music

* B3 (band), an American boy band most popular in Germany * ''B3'' (EP), a 2012 EP by alternative rock band Placebo *

Hammond B-3 The Hammond organ is an electric organ invented by Laurens Hammond and John M. Hanert and first manufactured in 1935. Multiple models have been produced, most of which use sliding drawbars to vary sounds. Until 1975, Hammond organs generated ...

, an electric organ

Other uses

B3 (stock exchange) B3 S.A. - Brasil, Bolsa, Balcão (in English, ''B3 - Brazil Stock Exchange and Over-the-Counter Market''), formerly BM&FBOVESPA, is a stock exchange located in São Paulo, Brazil, and the second oldest of the country. Its current form can be trac ...

B_3^I

, the

Bochvar logic Many-valued logic (also multi- or multiple-valued logic) refers to a propositional calculus in which there are more than two truth values. Traditionally, in Aristotle's logical calculus, there were only two possible values (i.e., "true" and "false ...

in calculus * B03,

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 * B3: Battle by the Bay, a 1996 ''Street Fighter'' tournament * B3 oil field, an oil and gas field in the Baltic sea * Model B3 chair, a 1925 German Wassili designer chair * A subclass of B-class stars in stellar classification * a permission code for

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 ...

* An ISO 216 international standard that defines paper size * B₃ the chemical formula for triboracyclopropenyl {{Letter-Number Combination Disambiguation