B40

B40, B-40, or B.40 may refer to:

Roads

Autovia B-40, a Spanish motorway in Catalonia
Bundesstraße 40, a German road

In Science

Borospherene, B₄₀, an allotropic cage-like molecule of pure boron
HLA-B40, an HLA-B serotype

Military

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

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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