What does the button 'a' in the car mean?

[DeJayce]

The button 'a' in the car refers to the Auto Hold system. Auto Hold is an automatic braking function. Once activated, for example, when stopping at a traffic light, it eliminates the need to pull the handbrake, simplifying operations by avoiding the use of a manual or electronic handbrake. For automatic transmission models, it also reduces the need for frequent shifting between D to N or D to P. Traditional handbrakes require the driver to manually release the brake or skillfully coordinate the throttle and clutch for a smooth start on a slope. The Auto Hold function, however, uses a slope sensor to provide precise braking force through the controller. During startup, the parking control unit calculates information from sensors such as the clutch distance sensor, clutch engagement speed sensor, and throttle pedal sensor. When the driving force exceeds the running resistance, it automatically releases the parking brake, ensuring a smooth start for the vehicle.