What does OON stand for? The Free Dictionary

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Acronym Definition
OON Only One Naked
OON Out of Nowhere
OON Object-Oriented Numerics (scientific computing)
OON Out of Network (health insurance)
OON Officer of the Order of the Niger (national honor; Nigeria)
OON Optimization of Optical Networks (workshop)
OON Ocean of Noise (Arcade Fire song)
OON Office of Neighborhoods (community resource)

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