This is the model variant or trim package in which a car is equipped.
Usually this is as simple as whether your car has a Turbo or not, but other times it is a bit more complicated.
The same model family car with a different trim package can use vastly different parts. For example, a S60R and a S60T5 have completely different interior, exterior, suspension and even different engines and transmissions.
Full Turbo models tend to have a more luxurious trim package than Light Pressure Turbo or non-turbo models.