We don't have this in our new member program either. Of course, I knew Tri Sig because they were at my school. Had you asked me about Kappa or Theta or Pi Phi, I'd have thought you were a loon
I think it's a good idea to add this to new member programs, as it gives people the impression of just how many national sororities there are, instead of just the ones on your campus.
And sig, I've had the same response when I said my sorority name once...don't worry girl