TeX-modes is a variable defined in tex-site.el. Its value is (tex-mode plain-tex-mode texinfo-mode latex-mode doctex-mode)
List of built-in TeX modes redirected to AUCTeX modes. This variable can’t be set normally; use customize for that, or set it with TeX-modes-set. You can customize this variable. -- Thanks, --Raman(I Search, I Find, I Misplace, I Research) ♉ Id: kg:/m/0285kf1 🦮 LOC: https://id.loc.gov/authorities/names/n97059241.html -- Thanks, --Raman(I Search, I Find, I Misplace, I Research) ♉ Id: kg:/m/0285kf1 🦮 LOC: https://id.loc.gov/authorities/names/n97059241.html