[Gibbon1]

> I don't understand why 'i' has been given a pass.

The reason is that in FORTRAN variables starting with i, j, k..n were defined as integers.

Back in the day I learned fortran first, then basic. People that learned basic first often would use the letter 'a' as a loop index instead of 'i'

Now days I still use 'i' but often use indx instead because my editor doesn't highlight single letter variables easily.

[majewsky]

I'm okay with "i" (like others said, it's a well-known shorthand for "iterator" or "index") but I often use "idx" because it can easily be combined with other words in nested loops (e.g. "rowIdx" and "columnIdx").