> Now, if a name is going to be easily changeable forever, please do make it descriptive. I’d much rather maintain code where the variables look like numCols and numRows than i and j. (Just, for the love of God, if you change the meaning, also change the name). But if a name is going to serve as, in any sense, an identifier, something that will point at a big complicated thing from many places far away, make it an opaque identifier.

The author is very clear about this matter.