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What does O/H stand for?

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Rank Abbr.Meaning
OHOffice Hour(s)
OHOld Harrovian (alumni of Harrow School, UK)
OHHospitallers Brothers of St. John of God (religious order)

showing only Organizations definitions (show all 44 definitions)

Note: We have 30 other definitions for O/H in our Acronym Attic