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A circle with a P inside, in brackets: the handbrake is on.
Also known as: Handbrake light, P in a circle with brackets
A P inside a circle inside two curved brackets. The brackets are brake pads, and the same brackets around an exclamation mark are the brake fault warning — a much more serious lamp.
A red tell-tale showing the letter P within a circle flanked by two curved arcs, indicating that the parking brake is applied.
What this lamp means on a particular vehicle, and what to do about it, is in that vehicle's handbook. The symbol names the system; it does not diagnose the fault.
Contexts: Vehicle dashboard
The same arcs around an exclamation mark rather than a P is the brake system warning, which reports low fluid or a fault rather than an applied handbrake.
Two lamps differing by one character in the middle, one routine and one serious.
A circle containing a capital P, with a short curved arc outside it on each side.