What does it mean that there is a crescent moon in texting on Apple's mobile phone?

There is a crescent in the upper right corner of Apple's mobile phone, which means do not disturb mode.

Apple is at

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Do not disturb mode is described in. When it is turned on, you can receive push notifications, text messages or reminders without making sound or vibration prompts. This function will be very useful in meetings, public activities or sleeping at night. There are two places in the settings where you can find the Do Not Disturb mode option. The first is that there is a switch option on the home screen, which can be turned on by clicking or sliding. When the "Do Not Disturb" mode is turned on, a small moon icon will appear in the status bar at the top of the phone.