From Longman Dictionary of Contemporary Englishnumber plateˈnumber ˌplate noun [countable] British English TTCone of the signs with numbers and letters on it at the front and back of a car → registration number SYN license plate American English
Examples from the Corpus
number plate• But the police say they can still prosecute because the real number plate shows up on the negative.• A parent who was taking her children to school noted down the number plate.• Hust the number plate to buy Auntie for Christmas.• The number plate tallied with the particulars they, and the local Securitate, had on record.• The number plate told me it was the same one I'd followed earlier.• And they identified your number plate. 