[klancaster]

Which extension do you use in Emacs to get the symbols?

[cefstat]

I am not aware of an extension doing this. I wrote some elisp for doing this a few years back.

[curiousgal]

Can you share your latex setup?

[jhanschoo]

Its something related to prettify and auctex; unfortunately im on mobile atm.

[svat]

cdlatex-mode has that feature IIRC. Probably auctex does too.