[yongjik]

A codebase easily contains thousands of identifiers - sometimes millions. You need a verbose, (hopefully) unique way to refer to them, because otherwise you will never find out which variable refers to what.

On the other hand, in a typical math textbook, the kind that will take you a full year to read through, the list of "all the symbols ever used in this book" usually fits in a single page.

There's no point in writing "CircumferenceRatio" when π does the job. Imagine solving a partial differential equation with CircumferenceRatio appearing five times each line.