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Signs & symbols
3D
Free 3d Glossy Interface Icon Set
warning, danger, Alert
Black
64x64
Prompt, danger, exclamation
Desktop apps
Smooth
Farm-fresh
Caution, Biohazard
32x32
voltage, high, Caution
Caution, radiation
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Family & home
Pixel
IconBeast Lite
Caution
30x30
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UI
Gnome Web Icons
Caution, Gnome, Battery
Mixed
Handdrawn
Web Design Creatives
mark, Caution
128x128
Computer & hardware
Discovery
Battery, Caution
Human o2
Caution, Battery
Tango