B21
B21 may refer to:
- B21 (band), a bhangra group
- B-21 (machine), a cypher machine invented by Boris Hagelin
- B21 (New York City bus) serving Brooklyn
- HLA-B21, an HLA - B serotype
Other uses
- North American XB-21, an experimental bomber aircraft
- Northrop Grumman B-21 Raider, a new generation long-range strategic bomber
- Volvo Redblock Engine, an automotive engine
References
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