black plate
n.— «This impulse to crush manifested itself at first in remote control cars before it found expression in karts. Novice racers begin in what is known as the black plate category. Drivers are required to complete six races before progressing to the next level.» —“Hamilton the driver with licence to thrill” by Kevin Garside Telepgraph (United Kingdom) Mar. 17, 2007. (source: Double-Tongued Dictionary)