B21
B21 may refer to:
Transportation
- B21 (New York City bus), serving Brooklyn, New York City
- BSA B21 (1937–1939), a British motorcycle made by Birmingham Small Arms Company, Birmingham, England
- Kepong–Selayang Highway (Selangor state route B21), Malaysia
- Leyland B21 (1979–1985), a bus chassis manufactured by Leyland
- Volvo Redblock Engine, an automotive engine
- A sports car built by Chevron Cars Ltd
Other uses
- B21 (band), a British bhangra group
- B-21 (machine), a cypher machine invented by Boris Hagelin
- HLA-B21, an HLA - B serotype
- Northrop Grumman B-21 Raider, an American stealth bomber
- Boron-21 (B-21 or 21B), an isotope of boron
See also
- Must B 21, a 2003 album by American singer will.i.am
- North American XB-21, an experimental bomber aircraft developed in the late 1930s
- 21B (disambiguation)
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