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The lamps a car uses to report its own condition. The colour carries more than the pictogram and is honoured far more consistently: red means stop when it is safe to, amber means attention, green and blue mean a system is simply running — and a driver who knows nothing else can act correctly on an unfamiliar symbol. Several of the pairs here differ by one detail and mean very different things: an oil can with a wave under it is a level to top up and the same can without it is no oil pressure, and brake-pad arcs around a P are the handbrake while the same arcs around an exclamation mark are a fault. What none of these records will tell you is whether it is safe to keep driving. That is in the vehicle's handbook, and a symbol dictionary has no basis for guessing.
Red, amber, green — the part of a dashboard that generalises across every car.
An amber coiled spring: a diesel is preheating, wait before starting.
An amber box with dots inside: the soot filter is clogging.
An amber droplet or tank: the exhaust fluid is low.
An oil can with a wavy line under it: the level is low, not the pressure.
A car with skid marks, with OFF beneath: the electronic safety net is disabled.
A circle with a P inside, in brackets: the handbrake is on.
A car seen from above with its doors swung out.
A car between two lane lines, one of them broken or highlighted.
A spanner: a scheduled service is due, not a fault.
A car with a key or padlock inside it: the vehicle does not recognise the key.
A letter A inside a circular arrow.
A plug, a battery or a car with a cable: the state of charging.