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Desktop apps
Glyph
16x16 Free Toolbar Icons
problem, warn, danger
Gold
16x16
Computer & hardware
Pixel
WooCons #1
Attention, sign, warning
32x32
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Files & folders
Smooth
Spirit20
Attention, Info, Information
SteelBlue
20x20
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UI
3D
Gnome Web Icons
Attention, warning, Dialog
DarkOrange
64x64
Attention, important
Black
Mixed
PixeloPhilia
Alert, Attention, exclamation
DarkSlateGray
Humility
Attention, Emblem, important
Simplicio
warning, Alert, Attention
Goldenrod
128x128
DelliOS System Icons
grey, Attention
512x512
Attention
Business & finance
Wireframe mono icons
48x48
Vista Style Base Software
Attention, Alert, Achtung
256x256
Free Applications Icons
Hand, Block, stop
Red
24x24
Message, Attention, exclamation
OrangeRed
Alert, exclamation, General
Tomato
Alert, hanger, warning
warning, ban, Block
danger, Message, Attention
Human o2
Print, Information, Attention
Diagona Icons
Attention, Alert, exclamation
DarkGoldenrod
Splashyfish
Error, Attention, exclamation
triangle, Attention, warning
Orange
Tango
Attention, update, software
DarkRed
Family & home
Cartoon
Kids
Critical, Attention, Error