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Files & folders
Smooth
DelliOS System Icons
Attention
Black
512x512
Business & finance
Glyph
Wireframe mono icons
48x48
Mixed
3D
Vista Style Base Software
Attention, Alert, Achtung
256x256
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Desktop apps
Free Applications Icons
Alert, hanger, warning
24x24
warning, ban, Block
Computer & hardware
Human o2
Print, Information, Attention
128x128
Family & home
Cartoon
Kids
Critical, Attention, Error
Pixel
DRF
Attention, Alert, exclamation
32x32
UI
Nuvola
warning, important, Attention