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Maybe this person was using it as the alt-right power sign? :( https://www.theguardian.com/world/2019/oct/03/ok-sign-gesture-emoji-rightwing-alt-right
To me, it looked like the "okay" gesture that I'd seen a lot in my teen and young adult years.
Yeah, it's the same sign. The alt-right just stole it. Google it.