B5

B5, B05 or B-5 may refer to:

Biology

• ATC code B05 (Blood substitutes and perfusion solutions), a therapeutic subgroup of the Anatomical Therapeutic Chemical Classification System
• Cytochrome b₅, ubiquitous electron transport hemoproteins
  • Cytochrome b5, type A, a human microsomal cytochrome b5
• HLA-B5, an HLA-B serotype
• Pantothenic acid (a.k.a. vitamin B₅), a water-soluble vitamin
• Proanthocyanidin B5, a B type proanthocyanidin

Entertainment

• Alekhine's Defence (ECO code B5), a chess opening beginning with the moves e4 Nf6
• B5, an R&B boy band now known as AUDIO
  • B5 (album), B5's self-titled debut album
• Babylon 5, an American science fiction television series

Transport

• Amadeus (airline) (IATA code: B5), an airline based in Germany (1996–2004)
• B5 and B5 DOHC, models of the Mazda B engine series
• B-5, a variant of the Blackburn Baffin biplane
• B5 platform, the series designator for Audi A4 from 1994–2001
• Bavarian B V, early German 2-4-0 locomotives of the Royal Bavarian State Railways
• Bundesstraße 5, German federal highway
• HMS B5, a Royal Navy B-class submarine
• Keystone B-5, a light bomber made for the US Army Air Corps in the early 1930s
• Kinner B-5, a popular five cylinder American radial engine of the 1930s
• Lohner B.V, a variant of the Lohner B.II military reconnaissance aircraft
• NSB B5 (Class 5), a series of passenger carriages built by Strømmens Værksted for the Norwegian State Railways
• PRR B5, an American 0-6-0 steam locomotive
• SM UB-5, a German Type UB I submarine or U-boat in the German Imperial Navy

Other

•  %B5, the percent-encoding for the letter µ
• B5, one of several paper size variants (176 × 250mm)
• B5, a category of stellar classification
• Bensen B-5, a small rotor kite

See also

• Big Five (disambiguation)