title: B5
text: # B5
  
  B5, B05, 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 $b_5,$ 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 $B_5),$ a water-soluble vitamin
  * Procyanidin B5, a B type proanthocyanidin
  
  ## Entertainment
  
  * Alekhine's Defence (ECO code B5), a chess opening beginning with the moves e4 Nf6
  * B5 (band), an R&B boy band
     * B5 (album), B5's self-titled debut album
  * Babylon 5, an American science fiction television series
  * The Be Five, a band formed by castmembers of Babylon 5
  
  ## 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, the manufacturer's model number for the Blackburn Baffin biplane
  * B5 platform, the series designator for Audi A4 from 1994–2001
  * Bundesstraße 5, a 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
  * 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
  * B5 biodiesel
  * LNER Class B5, a British class of steam locomotives
  
  ## Other
  
  * Baseball5, the five-a-side version of baseball
  * B5 Championships, a 2001 fighting game tournament
  * %B5, the percent-encoding for the letter μ
  * B5, a paper size of the B series defined in ISO 216
  * B5, a category of stellar classification
  * Bensen B-5, a small rotor kite
  * Border Five
  