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What does HAO stand for?

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Rank Abbr.Meaning
HAOHigh Altitude Observatory (US National Center for Atmospheric Research)
HAOHamilton, Ohio (Airport Code)
HAOHospice Association of Ontario
HAOHumanitarian Affairs Officer
HAOHealth Action Overseas
HAOHuman Appeal Organization
HAOHumanitarian Assistance Operation
HAOHaute Activité Oxyde (French: High Activity Oxide)

Note: We have 32 other definitions for HAO in our Acronym Attic

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