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Insignificant difference. I *think* APhiO tends to be more common in Region V, APO outside, but that was 20 years ago...
There is *NO* official abbreviation.
The prior website for the fraternity when it was run by a few alumni was aphio.org.
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Because "undergrads, please abandon your national policies and make something up" will end well  --KnightShadow
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