... DURING the 2006 GT game, making it NC STA E?
Multiple sightings (by fans of both teams) confirm this is NOT a Photoshop job.
GT fans a longstanding GT tradition is stealing the T off the sign on the Tech Tower.
"Dangt14" posted these images on a GT board
see a (somewhat blurred) closer-up image in the continuation
No signs of how the letter was attached can be seen in this image, but that could be because they are blurred by the extreme digital enlargement (in which details can be blurred out).
Some State fans have reported the letter fell into the stands below. They're of the opinion it just happened to come loose and fall during the game. If so, it was one heck of a coincidence.
GT fans would prefer to believe it was "helped" and this is another in a long line of GT pranks pulled on opponents.
We may never know for sure.