Yes, I remember it better now:
13 heavy
12 medium
11 light
10 extra light
9 ultra light
and that was fairly standard nomenclature for years, but many now regard 12 and 13 as standard. Bluegrass pickers went for the heavies, rock players for the skinny ones and blues and folk finger pickers for the mid range. There are also hybrid sets these days of course with heavier trebles and lower bass strings, the latter being the ones that were capable of damaging more delicate guitars.