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HBOHome Box Office (premium movie channel on USA cable systems)
HBOHyperbaric Oxygen
HBOHyperbaric Oxygenation
HBOHoger Beroeps Onderwijs
HBOHoney Bunches of Oats (cereal)
HBOHelp A Brother Out
HBOHumboldt, Nebraska (airport code)
HBOHorrible Body Odor
HBOHandled By Officer (police communications)
HBOHand Baggage Only
HBOHamilton Basketball Association (Recreation League in Canadian City)
HBOHigh Band Operator
HBOHuff, Barrington and Owens
HBOHistorische Bildungsforschung Online (German history of education research website)
HBOHollywood Bowl Orchestra (California)