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Signs & symbols
3D
Free 3d Glossy Interface Icon Set
Prompt, danger, exclamation
Black
64x64
Message, help, Prompt
OrangeRed
Prompt, help, danger
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Mixed
Webtoys
warning, sign
SandyBrown
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Soft media icons vol 2
warning
Silver
33x33
Maps & navigation
GPS Map icons
warning, pin, location
DarkRed
128x128
Business & finance
Shimmer Icons
warning, Alert
256x256
Refresh CL
security, warning
warning, Error
Gold
UI
Gnome Web Icons
Dialog, Gnome, warning
Chocolate
32x32
warning, Dialog, Gnome
48x48
Attention, warning, Dialog
DarkOrange
Crystal Office Collection
warning, 24
24x24
24, warning
Orange
Computer & hardware
iMod
warning, siren, robbery
512x512
Aire PNGs
OliveDrab
Vista Style Base Software
Attention, Alert, Achtung
grey, warning, shield
Network & communications
BeOS
beos, warning, Alert
Discovery
Dialog, warning
I like buttons
RoyalBlue
Desktop apps
Free Applications Icons
Hand, Block, stop
Red
Message, Attention, exclamation