What does the 'a' on the car button light represent?

[MacWeston]

The 'a' on the car button light represents the Brake Assist System. When the seat belt is properly fastened, pressing this button allows for automatic braking when temporarily stopping the vehicle. Releasing the brake pedal will prevent the car from rolling backward. To resume driving, simply press the accelerator lightly to release the brake and continue moving forward. The Brake Assist System serves as an auxiliary to the Anti-lock Braking System (ABS). ABS, developed by Robert Bosch GmbH, is a technology used in motorcycles and cars to prevent loss of control and generally increase braking distance, thereby enhancing vehicle safety. In ABS, the brake lines capable of independently adjusting brake pressure are referred to as control channels, which are categorized into four-channel, three-channel, two-channel, and single-channel systems.