A closed mailbox with its flag up, the US-style sign that mail is waiting. It means there is mail or a message to deal with.
People use it for โyou've got mail,โ for contact info, and for newsletters. Since a raised flag can also tell the carrier there is outgoing mail, some use it for letters ready to send.
Facts
Closed mailbox with raised flag ๐ซ is an emoji in the objects category, under mail. It is one of the early emoji from Japanese phones, standardized in Unicode 6.0 (2010). On GitHub, Slack and other apps you can type it as :mailbox: or :closed_mailbox_with_raised_flag:. People also look for it with words like โclosedโ, โcommunicationโ, โflagโ, or โmailโ.
Timeline
2010Added to the emoji standard (Unicode 6.0)
Design history
Google (Noto)
2015
2017
2021
Twemoji (X, Discord)
2014
Google Noto Emoji images: Apache 2.0. Twemoji graphics by X Corp and contributors: CC-BY 4.0.