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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
Message, help, Prompt
OrangeRed
Prompt, help, danger
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UI
Gnome Web Icons
Attention, warning, Dialog
DarkOrange
Attention, important
Mixed
Vista Style Base Software
Attention, Alert, Achtung
256x256
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Desktop apps
Free Applications Icons
Hand, Block, stop
Red
24x24
Message, Attention, exclamation
Alert, exclamation, General
Tomato
Alert, hanger, warning
warning, ban, Block
danger, Message, Attention
Goldenrod
Computer & hardware
Human o2
Print, Information, Attention
128x128
Photography & graphic design
Dark Glass
Call, Alert, Chat
WhiteSmoke
Attention, user, warning
MidnightBlue
Nuvola
warning, important, Attention
Alert, Attention, exclamation
DarkRed
48x48