1. "@" is a symbol, and its meaning in email applications is "at" (Chinese pronunciation Aite), that is, "a certain user" is on a "certain server". It is also used in social applications such as Weibo. Widely used.

2. In a car, an a inside a circle represents the automatic start-stop function.

After the vehicle reaches a certain speed and brakes, when the vehicle stops and continues to depress the brake pedal for 1 to 2 seconds, the engine will automatically shut down. When the brake pedal is released and the accelerator pedal is depressed, The engine will start automatically again.

This function is mostly used when waiting for traffic lights to reduce engine idling time, emissions and carbon deposits. It is recommended to turn off this function when driving slowly in traffic jams.

Steps for using automatic start and stop: When the driver needs to park temporarily, put the gear in neutral, then pull up the handbrake and release the clutch. The system will automatically shut down after receiving these three steps. The engine will start automatically when the clutch is depressed again.