Yes, you can. OPhiA doesn't have any rules against it, and I have seen Beta Sigma Phi's who also have membership in APhiO as well as NPC sororities, so I'm going to assume they have no restrictions on it either 
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Delta Sigma Theta "But if she wears the Delta symbol, then her first love is D-S-T ..."
Omega Phi Alpha "Blue like the colors of night and day, gold like the sun's bright shining ray ..."
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