In CS the tradition is to use longer and more descriptive names, in maths instead short and generic ones. I guess that on a blackboard it’s more useful to maxim

In CS the tradition is to use longer and more descriptive names, in maths instead short and generic ones. I guess that on a blackboard it’s more useful to maximize information density, in a text editor or an IDE instead clarity is more important. Even different programming languages have different conventions (short identifiers fir C and Fortran, long ones for Java and C#), which reflect the habits and preferences of their creators and users.