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What does OPSO stand for?

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Rank Abbr.Meaning
OPSOOperations Officer
OPSOOlder People Speak Out (Australia)
OPSOOsteopathic Physicians and Surgeons of Oregon (Portland)
OPSOOver Pressure Shut-Off (valve)
OPSOOpen Software (Italian software and web services company)
OPSOOffice of Pipeline Safety Operations (US DOT)
OPSOOverlapping Pairs Sparse Occupancy Test (random number generators)
OPSOOuachita Parish Sheriff Office (Monroe, LA)
OPSOOn Public Service Only (postage; New Zealand)

Note: We have 7 other definitions for OPSO in our Acronym Attic