\\cdot but not \\circ?

It looks like Desmos uses MathQuill, not Latex. Is there a place to find which symbols are supported? I can’t find it in the documentation. I want to use something like \circ (for function composition), but I can’t find anything that’s supported. Any ideas?

I just used https://www.alt-codes.net/circle-symbols, which had ○. I think this site will help for a while, but if there’s documentation I’m missing in MathQuill to know what symbols are supported, please let me know!