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In Britain, a P-plate is a small white square with a green letter P, fixed to a car. The driver has already passed the driving test and may drive alone — they are just still new at it. The sign is a quiet warning to everyone else: this person has passed, though actually they have not had much practice yet. In Britain you do not have to display it; some new drivers put it on, some do not. It is not the same as an L-plate, which is for a who has not passed. (Australia uses P-plates in a stricter, different way. The sense here is the British green P.)
P牌（英國剛考上駕照的綠P貼紙；不是實習駕駛，台灣也沒有這套）
組成P + plate. Plate here means a flat sign, like a number plate. In Britain the P is commonly taken to mark a driver who has passed but is still inexperienced.
同家族的字
- L-platethe learner's sign; L-plates are for people who have not passed yet
原始詞典資料2 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
P-platenoun
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A plastic square sticker or sign bearing a large letter P, placed on a vehicle to indicate that the driver only has a probationary driver's licence, for various possible reasons.
- 2
A plastic square sticker or sign bearing a large green letter P - optional not mandatory - placed on a vehicle, probably to indicate that the driver has recently passed his or her driving test.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。