If you use a vivo phone, the moon icon in the status bar indicates that the do not disturb mode is turned on. When "Do Not Disturb" mode is turned on, all incoming calls, messages and software notifications will be muted except those who are allowed to disturb. You can also set a time period to automatically turn on Do Not Disturb mode.

Setup Path: Setup-Sound and Vibration/Sound, Vibration and Silent Keys/Sound-do not disturb mode/Focus Mode.

Check the icon meaning displayed in the status bar: Web page link.

If you have more questions, you can enter vivo official website-My-Online Customer Service-Sliding Bottom-Online Customer Service-Enter Manual Customer Service and enter the consultation.