Input (grade 12): Open-wheel car, formula car, or often single-seater car in British English, describes cars with the wheels outside the car's main body and, in most cases, one seat.
Output (grade 8): Open-wheel car describes cars with the wheels outside the car's main body and, in most cases, one seat. Other names include formula car, single-seater car in British English, or Indy car in the United States.