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A red triangle outline: both indicators at once.
Also known as: Hazard lights, Four-way flashers, Red triangle button
A plain red triangle, always the same, always on a button rather than only a lamp. It flashes every indicator together to say the vehicle is a hazard where it stands.
A red equilateral triangle in outline, marking the control that flashes all direction indicators simultaneously.
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
Distinguished from every warning tell-tale by being a control the driver operates rather than a report the vehicle makes, which is why it is a button and not only a lamp.
An equilateral triangle in outline, standing on its base, with nothing inside it.