3-letter words starting with b
- bwg — Birmingham Wire Gauge: a notation for the diameters of metal rods, ranging from 0 (0.340 inch) to 36 (0.004 inch)
- bwi — British West Indies
- bwq — [IBM] Buzz Word Quotient. The percentage of buzzwords in a speech or documents. Usually roughly proportional to bogosity. See TLA.
- bwr — boiling-water reactor
- bwv — Bach Werke-Verzeichnis: indicating the serial number in the catalogue of the works of J. S. Bach made by Wolfgang Schmieder (1901–1990), published in 1950
- bx. — box.
- by- — near
- bye — Bye and bye-bye are informal ways of saying goodbye.
- byo — an unlicensed restaurant at which diners may drink their own wine, etc