☢
Radioactive Sign
- Unicode
- U+2622
- Category
- Dingbats
- Symbol Sets
- Cool Symbols
- HTML Entity
- ☢
- CSS
- \2622
The ☢ symbol represents the international radiation warning sign, also known as a trefoil, originally designed in 1946 to identify radioactive materials. In digital communication, it is commonly used to discuss nuclear energy, scientific hazards, or metaphorically to describe a highly "toxic" situation or online community. Added to Unicode in 1993, this iconic warning sign frequently renders as a yellow and black emoji on modern smartphones and operating systems.
How to Type
- Windows
- In Word: type 2622, then press Alt + X. Other apps have no standard Windows shortcut for it — copy it from this page
- macOS
- Control+Command+Space then search "radioactive"
- Linux
- Ctrl+Shift+U 2622 Space
- HTML
- ☢
In Programming
In programming, the radioactive sign is occasionally used in console logs or code comments to flag highly dangerous, "toxic", or deprecated sections of code that developers should handle with extreme caution.
Tags
atomic symbol
danger
dingbat
hazard
nuclear
nuclear energy
nuclear warning
radiation
radiation hazard
radiation sign
radioactive
radioactive emoji
radioactive trefoil
toxic symbol
trefoil
yellow warning sign