What is the red light on a BMW 318i with circle and dotted lines around it?

The red light on a BMW 318i with a circle and dotted lines around it is the Dynamic Stability Control (DSC) indicator. This system helps to control the stability of the vehicle by using the brakes and engine power to prevent it from skidding or losing control. If the DSC indicator is illuminated, it means that the system is activated and is currently working to keep the vehicle stable. It is important to note that the DSC indicator does not necessarily mean that there is a problem with the vehicle, but rather that the system is engaged.