I think the same kind of context heuristics used for single letter names could be extended to names like %tmp, %arg, and %data (or reaonsable single letters for cases like $c/$f/$k in a temperature sub). Check their scope. They are pretty reasonable in a small loop but I'd argue that in a main:: space or a block/sub longer than...? 10? lines, they could be named better and a critic rule might suggest that. Normally when I find myself using that kind of name it's out of haste and I wouldn't mind an automated kick in the pants to make me stop for 90 seconds to think about how it will really read to the next hacker (or to me in 6 months).