@mmasnick Actually on Qoto (my instance) and on Mathstodon we can use LaTeX with Mathjax: \[\mathbb R, \mathcal R\], and maybe even \[\mathscr R, \mathrsfs R\]. But on #Qoto Mathjax is kind of broken, and when the post gets syndicated to other instances it just shows up as raw LaTeX code unless they install Mathjax too.
Everyone ought to, because if people are discussing things without being able to use equations, there's really no hope of coming to agreement on basic facts, and Mathjax makes it enormously easier to use equations.
(Edited: I screwed up the Mathjax delimiters! Possibly because of Markdown actually.)