This is an officially licensed Shazam Logo from DC Comics. The shirt is made from heavyweight preshrunk 6oz cotton t-shirts. This design was worn by Sheldon on The Big Bang Theory (Season 1, Ep. 7 and Season 2, Ep 7).
What's cooler than a witty, comical (or dorky) t-shirt? Also, worn by Sheldon the show "the big bang theory."