U+1F6D1 · emoji since 2016
The stop sign is the bright red octagon that means halt, right now. It marks warnings, hard nos, and please do not do that.
Online it dramatically cuts off a thought or a bad idea, the visual equivalent of stop, just stop.
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 Stop Sign emoji. In everyday chat most people just call it the stop sign 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.