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Gaming & gambling
3D
Free Game Icons
warning, Blaze, Attention
Black
64x64
Signs & symbols
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Hand, warning, Abort
warning, danger, Alert
Prompt, danger, exclamation
Prompt, help, danger
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UI
Gnome Web Icons
Attention, important
Mixed
Vista Style Base Software
Attention, Alert, Achtung
256x256
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Desktop apps
Free Applications Icons
Alert, hanger, warning
24x24
warning, ban, Block
Computer & hardware
Human o2
Print, Information, Attention
128x128
Nuvola
warning, important, Attention