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The densest set of codes most people own, met at the moment of buying something. Each record names the misreading, because in this domain the misreading is the reason anybody looks the symbol up: the W in an oil grade stands for winter rather than weight, an aspect ratio is a percentage of the width rather than a height in millimetres, a four-digit oval is a manufacturing date on rubber that ages whether or not it is used, and the visible metal under a modern bumper is not a recovery point.
A coded string on a sidewall giving width, profile, construction and rim size.
A number and a letter after the size, giving load capacity and maximum speed.
Four digits in an oval giving the week and year a tyre was manufactured.
A small triangle or letters on the shoulder, pointing at a moulded wear bar.
A code such as 5W-30 giving an oil's cold and hot viscosity behaviour.
A circle, square or diamond on a pump and filler flap identifying the fuel.
An outline of a plug's pin pattern, identifying a charging connector type.
A letter E in a circle with a country number, marking a type-approved part.
A hook symbol or removable cover marking a vehicle's rated recovery point.