U+1F515 Bell with Cancellation Stroke

The Wikipedia has the following information about this codepoint:

Silent mode is a setting available on mobile phones and pagers that, when activated, disables the ringtones and, in some cases, also the vibrating alerts or alarm. Unlike the airplane mode, the silent mode still allows the device to receive and send calls and messages. This quiet option may be useful in meetings, speeches, libraries, museums, or places of worship. In some places it is mandatory to use the silent mode or to switch off the device.

As mobile technology has evolved, so has the functionality of silent mode. Modern smartphones now allow users to customize silent mode with more granularity, such as enabling vibration alerts for specific contacts or allowing certain types of notifications (e.g., alarms or emergency alerts) to bypass the silent setting. Additionally, some devices integrate automated silent mode features, activating it based on location, time of day, or during calendar events. This automation helps users maintain phone etiquette in social or professional environments without manual input.

Silent mode also plays a significant role in accessibility, particularly for individuals with hearing impairments. By utilizing vibration or visual notifications (such as flashing lights), devices in silent mode can still alert users to incoming calls or messages without relying on sound. Additionally, many devices allow integration with accessibility features, ensuring that users can customize notifications in ways that best suit their needs. This ensures that silent mode remains functional and inclusive for a wider range of users.