Transportation
- Bürgenstock-Bahn, a funicular railway in the Swiss canton of Nidwalden
- Toyota bB, a car sold in Japan
- NZR Bb class, a New Zealand locomotive class
- Seaborne Airlines' IATA airline code
- Buckingham Branch Railroad's reporting mark
- Battleship, a US Navy hull classification symbol
- Bottom bracket, the crank hub of a bicycle
- Former name for the B (New York City Subway service)
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