[gmiller123456]

Trying to abbreviate greek variables ends up causing a lot of issues too. It's common to have both "zeta" and x,y,z in the same scope. As well as a capital and lower case zeta. And maybe a zeta prime, and some subscripts. Unless you plan well ahead, it's hard to be consistent across all parts of the code and be concise at the same time.

Trying to come up with more descriptive names isn't practical as the variables often have very complex definitions, and it'd be impossible to explain in a variable name.