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- ...

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

Next-Generation Bomber The Next-Generation Bomber (NGB; unofficially called the 2018 Bomber or B-3 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, subson ...

(2018 Bomber), next bomber follow-on to the B-2 stealth bomber program * Long Range Strike Bomber program, 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) The designation B.III was used for two completely unrelated aircraft produced by Fokker Fokker (; ) was a Dutch aircraft manufacturer that operated from 1912 to 1996. The company was founded by the Dutch aviator Anthony Fokker and became famous ...

, two aircraft models * Halberstadt B.III, a German Idflieg B-class designation aircraft * Kampfgeschwader 54, from its historic ''Geschwaderkennung'' code with the Luftwaffe in World War II * Lohner B.III * LVG B.III, 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) * Bundesstraße 3, a German national highway

Trains

* Alsace-Lorraine B 3, an Alsace-Lorraine P 1 class steam locomotive * Bavarian B III, an 1852 German steam locomotive model * NCC Class B3, an 1890 Irish 4-4-0 passenger steam locomotive * NSB B3 (Class 3), Norwegian railway carriages * LNER Class B3, a British locomotive class

Other

* B3 (New York City bus) serving Brooklyn * Bellview Airlines (International Air Transport Association code B3)

Biology and medicine

B3 (classification) B3 is a medical based Paralympic disability sport classification, classification for blindness, 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 inc ...

, a medical-based Paralympic disability sport classification for blind sport * B3 domain, a highly conserved plant DNA-binding domain * Procyanidin B3, a plant phenolic compound * ATC code B03 ''Antianemic preparations'', a subgroup of the Anatomical Therapeutic Chemical Classification System * Prodelphinidin B3, 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 TC ...

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

cryptocurrency A cryptocurrency (colloquially crypto) is a digital currency designed to work through a computer network that is not reliant on any central authority, such as a government or bank, to uphold or maintain it. Individual coin ownership record ...

Engines

* A type of four-cylinder

Mazda B engine The Mazda B-series is a small-sized, iron-block, straight-4, inline four-cylinder engine with Timing belt (camshaft), belt-driven SOHC and DOHC valvetrain ranging in displacement from 1.1 to 1.8 litres. It was used in a wide variety of applicatio ...

* 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, first manufactured in 1935. Multiple models have been produced, most of which use sliding #Drawbars, drawbars to vary sounds. Until 1975, sound was created ...

, 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 in the country. Its current form can be ...

B_3^I

, the Bochvar logic in calculus * B03,

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 * 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 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 ...

* a permission code for

Town and country planning in the United Kingdom Town and country planning in the United Kingdom is the part of UK 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 planni ...

* An

ISO 216 ISO 216 is an international standard for paper sizes, used around the world except in North America and parts of Latin America. The standard defines the "A", "B" and "C" series of paper sizes, which includes the A4, the most commonly availabl ...

international standard that defines paper size * B₃ the chemical formula for triboracyclopropenyl