James, you're such a goof
A Sweetheart is either a woman that basically helps out the chapter a lot and they nominate her, so she's allowed to wear letters. (Depends on the the fraternity though) Russell's definition answered your question much better than mine, heh
In my case, I'm pinned, it's a fraternity engagement between a fraternity member and his girlfriend. In some Greek systems it goes shirting/lavaliering/dropping, pinning/engagement, marriage.
I'll have to put up the TKE Sweetheart song later, it's sooooooo sweet
