PNG ICO ICNS MORE
Signs & symbols
3D
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Black
64x64
warning, danger, Alert
Prompt, danger, exclamation
Message, help, Prompt
OrangeRed
Prompt, help, danger
Computer & hardware
Keyboard keys
exclamation
Gainsboro
128x128
Mixed
Vista Style Base Software
Attention, Alert, Achtung
256x256
PNG MORE
Desktop apps
Free Applications Icons
Message, Attention, exclamation
24x24
Alert, exclamation, General
Tomato
Alert, hanger, warning
danger, Message, Attention
Goldenrod
Flavour Extended
exclamation, Key
WhiteSmoke
48x48
UI
Nuvola
Alert, Attention, exclamation
DarkRed
Crystal Clear
Arrow, update, download
SandyBrown