B40, B-40, or B.40 may refer to:
Roads edit
- Autovia B-40, a Spanish motorway in Catalonia
- Bundesstraße 40, a German road
In Science edit
- Borospherene, B40, an allotropic cage-like molecule of pure boron
- HLA-B40, an HLA-B serotype
Military edit
- Vietnamese designation of the RPG-2, the first rocket-propelled grenade launcher designed in the Soviet Union
- BSA B40, a 350cc British motorcycle
- Blackburn B.40, an experimental Blackburn flying boat
- Rolls-Royce B40 Engine, an inline-four petrol engine primarily used in the Austin Champ
- Unterseeboot B-40, World War I Imperial Germany Navy submarine U-boat
- YB-40 Flying Fortress, an aircraft
Other edit
- 40 amp, type B – a standard circuit breaker current rating
- B40 Balkan Cities Network, an intercity organization between Balkans cities
- Sicilian Defence, Encyclopaedia of Chess Openings code
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