What does it mean a rover 75 yellow warning light looks like sun with the mark of exclamation in it?

The yellow warning light that looks like a sun with an exclamation mark in it on a Rover 75 is the Engine Coolant Temperature Warning Light. This light indicates that the engine coolant temperature is too high and that the engine is at risk of overheating. If you see this light, you should stop driving immediately and allow the engine to cool down. You should also check the coolant level and top it up if necessary. If the light persists, you should have your car checked by a qualified mechanic.