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H-bar or h-bar can refer to:

  • H with stroke, a Latin letter H with a doubled horizontal stroke (Ħ ћ)
  • reduced Planck constant, which the above symbol represents as a mathematical symbol, ћ = h/(2π)
  • Antihydrogen, an antimatter element represented by the symbol H
  • Steyr AUG H-bar, the light machine gun version of the AUG assault rifle