U+26A0, ⚠
WARNING SIGN

[U+269F]
Miscellaneous Symbols
[U+26A1]
Presentations of ⚠︎
Text
style
Emoji
style
⚠︎ ⚠️
Note: Character's appearance
may be different on each system.
Text style is forced with ︎
and emoji style with ️

Emoji