Like most people who learned Fortran as one of the first
languages I,J and K are the favoured loop variables. In Fortran
(at least those Fortrans that were in vogue in the 70's) any
variable that begain with the letters I,J or K were automatically
typed as integer.....meaning you didn't have to declare them.

For non-loop variables I prefer KKK and xxx.

Simon......awwww forget it. If it has to be explained, you
wouldn't be able to understand.