As I'm sure you know, gamma_girl, a lot of APO chapters nickname (without pledgelines) and a handful of non-HBCU chapters do line up.
What's REALLY interesting to me is when I went to my first national conventions, I saw MAAAADDDDD heads wearing letters with nicknames. . .but instead of line numbers, they wear their chapter numbers! Meaning, instead of a 2 or 9 like me and Astute, they would have like 67, 152, or 348!
It's just another example of our organizations' regional differences, like i was mentioning in another thread. Personally, I wouldn't want my chapter number on my 'nalia. . .because too many fools would ask me if I was number 778 on my line.