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Network & communications
Flat
E-mail
mail, red, warning
IndianRed
512x512
Glyph
Communication & Technology
wave, Attention, Error
Black
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Pixel
16x16 Free Application Icons
warning
Goldenrod
16x16
prohibition, danger, reject
Firebrick
Caution, warning, danger
DarkSlateGray
danger, wind, Gesture
Salmon
3D
BeOS
beos, warning, Alert
128x128
Smooth
Oxygen
remove, delete, warning
Gray
48x48
Dialog, warning, Alert
Orange