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UI
Glyph
Freecns Cumulus
warning
Red
512x512
warning, Cloud
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Business & finance
48x48 Free Time Icons
anxiety, Alert, hospital
48x48
warning, Alert, Hand
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24x24 Free Application Icons
Error, sign, Blocked
24x24
Desktop apps
3D
Free Applications Icons
Hand, Block, stop
Pixel
Splashyfish
Error, Attention, exclamation
16x16