Maybe different people do it differently, after all some have photographic memory, I don't. But I certainly don't think about all the letters involved in a variable but rather the concept of the variable, or what that variable represents. Doesn't matter if it's called "numberOfBurgersPerCustomer" or "nb" as such. But in case I forget, "numberOfBurgersPerCustomer" immediately tells me what is going on compared to just "nb".

I guess the point is that I don't want to wade in definitions just to get the gist of a code. I want to jump in there, see immediately what's going on and where the problem can be.