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HOI [hɔɪ] abbr.
abbr.	Halo Orbit Insertion
abbr., avia.	Hao Island, Tuamotu Island
abbr., cardiol.	hangout interval (eugeene1979)
abbr., el.	high order interface
abbr., med.	hospital onset infection
abbr., railw.	Higher Order Interface
mil.	handbook of operating instructions; handbook of overhaul instructions; headquarters office instruction; headquarters operating instructions
HOI [hɔɪ] abbr.
abbr., busin.	Handbook of Overhaul Instruction