B4P stands for Born for Performance (Bianchi bicycle series)
B721 stands for Boeing 721-100 (airliner)
B6MEF stands for C57Bl/6 Mouse Embryo Fibroblast
B6P stands for Band 6 Polypeptide
B7 stands for Banned B7 stands for Blake's 7 (TV Series)
B707 stands for Boeing 707 (airliner)
B720 stands for Boeing 720B (airliner)
B731 stands for Boeing 737-100 (airliner)
B733 stands for Boeing 737-300 (airliner)
B732 stands for Boeing 737-200 (airliner)