This is for notion KaTex backend for math formulas. I'm aware of the question double perpendicular symbol (for independence) or others solutions for latex. But as notion does not support explicit library import nor defining function. Seems like it is impossible to use double perpendicular symbol in notion... Just in case anyone is aware and also wanted to type nicely done equation in notion.
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\mathrel{\bot\mkern-10mu\bot}will do. – egreg Feb 09 '22 at 13:19