Elias Mårtenson on Nostr: I found the proposal. This is actually the chess symbol, and the argument is that ...

I found the proposal.

This is actually the chess symbol, and the argument is that some authors prefers to write it with the infinity symbol above instead of below the equals sign.

https://www.unicode.org/L2/L2024/24018-one-chess-symbol.pdf

So arguably it isn't a maths symbol.