What is the button with an 'A' in a circle?

[HazelMarie]

a in a circle is the auto start-stop function switch button. The engine auto start-stop system automatically shuts off the engine when the vehicle comes to a temporary stop (such as at a red light) during driving. When it's time to move forward again, the system automatically restarts the engine. This system works by equipping a traditional engine with an enhanced motor that has idle start-stop functionality, allowing the engine to completely shut off when idle stop conditions are met. When the vehicle needs to start moving again, the idle start-stop motor system quickly responds to the driver's start command, rapidly restarting the engine for seamless operation, thereby significantly reducing fuel consumption and exhaust emissions.