I generally use ‘count’ for a counter and ‘idx’ for index.
I’m not using C or Java languages though - if I were I would probably go with the more classic terse approach.
Also, if I’m reviewing a PR and I have to load more of the diff context to understand what a variable represents, then that variable has the wrong name.
This really hits home and is something I simply don’t see often in juniors today - a desire to tinker, experiment or ‘play’ to figure out how a problem might be solved. I’m always telling them to allow themselves to struggle for at least an hour or two before asking for help.