U+1F4EC · emoji since 2014
The open mailbox with its flag up means you've got mail waiting. It marks deliveries, letters, and a full inbox at the curb.
It is the cheerful icon for something has arrived, the little flag that says come and check.
In texting, 📬️ does not carry a widely used hidden or slang meaning, so you can usually take it at face value. People send it just as it looks, to add a little visual touch or set the mood of a message. Only a handful of emoji have a separate texting code, and 📬️ is not really one of them.
Its official Unicode name is the Open Mailbox with Raised Flag emoji. In everyday chat most people just call it the open mailbox with raised flag emoji or describe what it shows. Copy and paste it from the button at the top of this page.
The 📬️ leads off a short phrase, and the rest of the words are written in cipher, every letter disguised as another emoji. Tap decipher to reveal the whole line.
Or make your own cipher in the translator.