There are a number of other schools that I might attend if I didn't get in anywhere else. For instance, I'd almost certainly go to Ohio State or UW Madison if admitted, but I'd be less likely to attend those school than anywhere else on the list above, so by "safety school" what I really mean is "places to which I'd be almost certainly be admitted and happy to attend."
I was thinking that UNC would be such a place, but if my list was aiming too high, there could be others.
-Q
P.S. @currentpsstudent I plan on walking to "School." I hear it's uphill both ways.