This designation signifies a high-performance variant of Audi models, such as the RS3, RS4, RS5, RS6, RS7, and RS Q8.
However, other car manufacturers might have a similar "R" designation on their performance models. For example:
* Renault Sport models often have an "R.S." badge.
* Hyundai N performance models often have an "N" badge, though some have an "R" badge as well.
To be more specific, please provide more context about the car you are thinking of, such as the make, model, or year.
