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Files & folders
Flat
small-n-flat
warning, shield
Black
512x512
Computer & hardware
Glyph
3D Maker Vol 1
sign, Attention, warning
Goldenrod
Cog, Attention, warning
Crimson
UI
Typicons
warning
Freecns Cumulus
errror, warning, Cloud
warning, Error, Attention
Cloud, warning
Red
warning, Cloud
mark, exclamation, Error
Information, warning
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Halloween
Photorealistic
Desktop Halloween
user, kill, Caution
256x256
Holiday, problem, warning
DarkSlateGray
Celebration, tale, Game
Chocolate
Mixed
Smooth
Tango Icon Library
warning, Dialog
Gaming & gambling
3D
Free Game Icons
warning, Blaze, Attention
64x64
danger, Explosion, Bomb
Photography & graphic design
32x32 Free Design Icons
32x32
48x48 Free Object Icons
Alert, fire, combust
48x48
bombshell, Bomb, war