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Business & finance
Glyph
48x48 Free Time Icons
warning, medicine, siren
Black
48x48
war, Military, danger
DarkSlateGray
Abort, exclamation, Up
Tomato
anxiety, Alert, hospital
Red
warning, Alert, Hand
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Pixel
24x24 Free Pixel Icons
warning
24x24
weapon, Caution, Bomb
24x24 Free Application Icons
Goldenrod
stop, Abort, Block
Attack, Error, Alert
Error, sign, Blocked
Network & communications
16x16 Free Application Icons
16x16
prohibition, danger, reject
Firebrick
Caution, warning, danger
danger, wind, Gesture
Salmon
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UI
Smooth
Snipicons
warning, sign
512x512
Desktop apps
Free Funktional Icons
Windows 8 metro style
shield, warning
Mixed
3D
Noiro
Alert, warning
Chocolate
128x128
Iconza
32x32
IndianRed
DarkGray
DarkSeaGreen