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A curved rectangle with three wavy arrows rising through it.
Also known as: Defrost, Screen with three wavy arrows
The wavy arrows are warm air. Curved outline means the windscreen; a rectangular outline with the same arrows is the rear screen, and the two controls do different things to different glass.
A control marking the windscreen demister: a curved screen outline crossed by three upward wavy arrows.
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
A rectangle with one curved side, containing three upward-pointing wavy arrows in a row.