B3
# B3

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

## Military

### American bombers

* Keystone B-3, a biplane bomber of the United States Army Air Corps
* Next-Generation Bomber (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), 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), 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 $B_3$ (niacin)

## Computing

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

## Engines

* A type of four-cylinder Mazda B engine
* 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, an electric organ

## Other uses

* B3 (stock exchange)
* $B_{3}^{I}$, the Bochvar logic in calculus
* B03, Alekhine's Defence 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
* An ISO 216 international standard that defines paper size
* $B_3$ the chemical formula for triboracyclopropenyl
