Titan Tron is the name given to the big video screen present during WWF wrestling events. The name derives from the (former?) name of the company running the World Wrestling Federation, Titan Sports, and -tron, which for some reason signifies video screens (perhaps from Trinitron?)
It's where the wrestler's entrance video is played, and also where the evil Vince McMahon's face is displayed, taunting the good-guy wrestlers.