[Lady Pi Phi]

I'm sure this thread has been done before, just don't know where it is.
I was watching an episode of friends. The one where Rachel bumps into an old college friend. The one she apparently kissed at the Sigma Chi luau (sp?). Did I hear this correctly? Are they not supposed to use fake names...unless of course they have permission. Just something I heard. The other one they mentioned was Theta Beta Pi...