This is the Collision Mitigation Brake System (CMBS) Indicator symbol. It is a radar-based system that can warn a driver of a potential collision or even apply the brakes to prevent one. These systems are all moving in the direction of automatic braking, which all manufacturers have promised to install in all passenger vehicles by roughly 2020.
The light comes on if the system has been turned off, if the radar sensor is dirty or blocked, or if there is a fault in the system. In the last case, take the vehicle to your dealer or authorized service center for diagnosis and repair.
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