Does anyone know a lot about Triumph motorcycles?

I just got a Triumph Legend 900 and on the windshield there is a sticker with a rat on it, and the letters R A T. What does that mean? And, does anyone know about the Triumph legend? I had never heard of it until someone traded it in at a local dealership. Can you tell me about it ? And what is a Legend TT? My bike doesn't say TT on it anywhere. Is there a difference? Thanks for the help!!!!