What does TT mean in motorbike racing?

TT stands for Tourist Trophy and is a motorcycle race held on the Isle of Man. It is one of the oldest and most dangerous races in the world, and is unique in that it is held on public roads. The race includes a number of different classes, ranging from solo to sidecar racing. The track is 37.73 miles long and includes tight turns, narrow roads, and a number of hills and mountains. It is considered a high risk event, with several fatalities and injuries occurring every year. The race has been held since 1907 and is a major tourist attraction for the Isle of Man.