R U H squared?

Not sure what that means?  Well here's a picture to help you out.

 

Yes, that's me in my bathroom mirror.  What you should notice is the front of the shirt I'm wearing.  It says, "R. U. H. 2?  The two is up high after the H, to signify squared.  What is that?  Well, somehow I thought you might ask.  I will give you some hints, but I can't reveal all until September 1st.  The t-shirt was sent to me by an author, who's book debuts on 9/1.  I would show you the back of the shirt, which is also cool, but that would give it away, and I'm not prepared to do that just yet.  Feel free to guess...