PNG ICO ICNS MORE
Mixed
3D
Web Application Icons Set
Alert, warning
Gold
48x48
UI
Pixel
Fugue Icons
cross, Circle, Error
DarkSlateGray
16x16
Desktop apps
Smooth
KDE Crystal Diamond
messagebox, warning
Black
22x22
Nuvola
warning, important, Attention
128x128
Alert, Attention, exclamation
DarkRed
Nuove
warning, cancel, stop
Firebrick
warning
Orange
Computer & hardware
realistiK Reloaded
Crystal Clear
Info, warning
Chocolate
32x32
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Mini
Khaki