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The coil sign on an instrument cluster is for the heating coils on a diesel engine.
Diesel engines don't have spark plugs to ignite the fuel and instead depend on the high pressure from the pistons to heat up the air to a point that it will spark ignition. During a cold statup, a heating coil (like a car's cigarette lighter) heats up the air in the cylinders to bring the temperature up to where the diesel fuel will ignite.
When the coil light is illuminated, it means that the coils are warming up. When the coil light turns off the engine is ready to start. Be sure to read your vehicle's manual for the exact starting procedure as it varies from vehicle to vehicle.
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