From Japanese driver's manual:
New drivers have to display the green and yellow beginner symbol (shoshinsha mark), also known as the young leaf symbol (wakaba mark). If you notice that a driver has one of these marks, please be a considerate driver and treat them with special care. Do not tailgate (follow too closely) or change lanes suddenly.Set of two leaves, one magnetic and one with a suction cup. Put them on the trunk and rear window, both doors, on your fridge, or wherever.. Each is about 7" long x 4.5" wide . A great gift!