What does the 'a' circle on a car mean?

[DiAlexander]

The 'a' circle on a car represents the auto-hold function. When this switch is activated, after the vehicle is braked during driving, even if the brake is released, the vehicle will not continue to move. It will only resume driving when the driver presses the accelerator, and can only be turned off manually. The working principle of the start-stop system is: when the vehicle stops due to traffic congestion or at an intersection, the driver presses the brake pedal and shifts to neutral. At this time, the Start-Stop system automatically detects whether the engine is idling without being in gear, whether the wheel speed sensors of the anti-lock system show zero, and whether the electronic battery sensor indicates sufficient energy for the next start. If these three conditions are met, the engine automatically stops running.