What is the name of Telegram's feature for sending messages without notification?

Telegram’s feature for sending messages without a notification sound is called Silent Messages.

Telegram introduced Silent Messages in 2019. To use the feature, a sender presses and holds the Send button and chooses the silent option. The message is delivered normally, but the recipient’s device does not play the usual notification sound, making it useful when someone may be sleeping, working, or in a meeting.

The current interface commonly labels the action “Send Without Sound,” which is why the feature can appear to have two names. Telegram’s announcement and feature documentation call the capability Silent Messages, while the button describes what it does. “Mute Messages” is different: muting generally changes notification settings for a chat, rather than applying a silent-delivery choice to one outgoing message.

Silent does not mean hidden, encrypted, or unread. The recipient can still receive a notification, see the message in the chat, and respond normally; the defining difference is that the delivery is intended not to make a sound.