Cutie, I think it's Iota Chi Omega. There is definately another letter there, and if you look at the guy in the black tank top, his letters are Iota Chi Omega.
You know that there's no way Chi Omega (or any sorority or fraternity) would let a film like that use their letters!
In fact, I was once talking to a staff member of Tri-Delta, and she was saying that they get approached
all of the time for people to use their letters and/or greek houses (esp. some in CA I guess) in films. And it's
never any situation you would want your GLO represented in, so of course they say no. But it makes you wonder why those people would think you would want that kind of exposure in the first place
.