That depends on what the loop, temp var (etc.) does. Sometimes having a meaningless name like that is perfectly fine, something you need something more descriptive as it may help read what's being done more easily (I just coded a case like that this morning).
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It all depends on your language's conventions. I've often seen these be standard, many coming from mathematics itself:
i,j: indices, loop control variables (no lifetime beyond context).x,y,n: temporary variables in algorithm (no lifetime beyond algorithm)n,num: temporary "number", such as an accumulator or the current value when iterating over numbers (no lifetime beyond context).v,val: temporary value, usually from iteration (no lifetime beyond context)x,y,z: coordinates (meaning from context).len: lengthiter,it: iteratorBeyond that, you should probably write real names.
That depends on what the loop, temp var (etc.) does. Sometimes having a meaningless name like that is perfectly fine, something you need something more descriptive as it may help read what's being done more easily (I just coded a case like that this morning).