2) A scale by which to describe something that in no way involves numbers in any way.
John: Yo, look at that chick.
Paul: Ehh, she's like a 5 at best.
John: Whatever man, she's at least a 7.
Anthony: So on a Scale of 1 to 10 how was your day?
Jackie: On a scale of 1 to 10, it was pretty awesome.
Anthony: That made absolutely no sense. But I like it.
Steve: really? how hot was she? scale of 1 to 10?
Bob: I'd rate her an 8
Steve: Nice man!
Bill: who's this chick that Mike's going out with? I hear she isn't that good looking
Joe: yeah, I've met her, she's pretty ugly
Bill: Scale of 1 to 10?
Joe: Dude, the scale doesn't go that low, I think I'd rate her a -5