L platen.
/ˈɛl ˌpleɪt/, U.S. /ˈɛl ˌpleɪt/ In Great Britain, Ireland, and some Commonwealth nations.
A sign bearing the letter L, attached to the front and rear of a motor vehicle to indicate that it is being driven by a learner driver.
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1935 Citizen (Gloucester) 23 Aug. (Final ed.) 5/1 About 2,000,000 ‘L’ plates have been provided by the Ministry, and distributed to licensing authorities,..so there should be no difficulty for the learner-driver to conform with the regulations.
1959 Guardian 27 Aug. 6/3 There are still an unknown number of drivers..who may have used L-plates for years without even applying for a test.
2015 R. Harris Heartbreak & Happiness (2016) xlvii. 200 I'll get some L-plates for my car, and take you out and see how you get on.
Derivatives
ˈL plater n. the driver of a car with L plates; a person who is learning to drive.
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society > travel > transport > transport or conveyance in a vehicle > driving or operating a vehicle > driver or operator of vehicle > [noun] > driver of motor vehicle > learner
learner1930
1960 Punch 13 Jan. 82/2 I sympathize with the non-L motorist who spends so much of his time pulling out in wide, cautious arcs round L-platers.
2022 @LadyDaemontus 7 Jan. in twitter.com (accessed 2 June 2022) Anyways, just passed another milestone in my driving. Did my first set of roundabouts... Also drove at the max speed limit for an L plater.
This is a new entry (OED Third Edition, December 2022).
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n.1935