U+1F506 · emoji since 2015
The bright button is a sun-like symbol for high brightness. It means turn up the light, full glow, and screens at max shine.
It also stands in for brightening the mood, the little boost that makes everything feel a bit more lit up.
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 Bright Button emoji. In everyday chat most people just call it the bright button 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.