They don’t always use the latin alphabet. In University I hated my prof using the same letter over and over again in different writing systems. x, chi, Gothic x, x with hat, x with dash, x as a vector etc. etx.

This was crazy hard for me as I internally verbalize when I read formulae, so I had to “invent” different pronunciations for evey different version of x. Because (for example) one is the vector, but the lowercase latin version is just the length of the vector.

Along with the fact that people use slightly different conventions and then conventions in math are different in the anglosphere vs here - I frequently couldn’t understand a paper or script without having an idea how things worked in the first place. A didactical nightmare.