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H-block or h-block can refer to:

  • H engine, with cylinders in an H pattern
  • Maze (HM Prison), Belfast, where the prison blocks were built to a uniform H-shaped plan
  • A type of barrack block found on many RAF stations 1939-70, also built to an H-shaped floor plan. Built of brick, two storeys high, each housed 200 airmen in 8 dormitories.
  • H-block in aggressive inline skating, part of the frame of the skate
  • The 1915–1920 and 1995–2000 MHz radio frequency bands, used for wireless broadband communications (currently licensed to Dish Network)[1]

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