So this "OA" thing seems to have some kind of significance apart from the Netflix series. The key here is the dominance of the O form, indicating it's the primary element. The anarchy symbol, the Avengers logo and the Alpha-Omega symbol all center on the A element.
There's a possibility OA is a reversal of Alpha-Omega, which may have some ritual significance.
Logo for the popular Ancient Origins website
Logo for the Aerospace corporation
Seal of the former German Democratic Republic
The British Communist Party logo
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