Noun
P-plate (plural P-plates)
(UK, Australia) A plastic square sticker or sign bearing a large letter P, placed on a vehicle to indicate that the driver only has a provisional or probationary driver's licence.
A sharp increase in P-plate drivers exceeding the speed limit on the M5, with some detected travelling at more than 150kmh – one clocked at 171kmh – has also caused concern. Source: Internet