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UI
Outline
ikooni outline: Free Basic
Caution, Error, danger
Black
512x512
Error, Caution, Alert
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Flat
Metro UI Icon Set
Caution, Lan
Orange
Pixel
Boolean
Caution
Gold
16x16
3D
Gnome Web Icons
Gnome, Battery, Caution
Gray
32x32
Caution, Battery, Gnome
48x48
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Caution, Gnome, Battery
64x64
Tango
Caution, Battery
Smooth
Function icons
triangle, sign, Caution