PNG MORE
Business & finance
Pixel
24x24 Free Pixel Icons
weapon, Caution, Bomb
DarkSlateGray
24x24
PNG ICO ICNS MORE
Network & communications
16x16 Free Application Icons
danger
OrangeRed
16x16
prohibition, danger, reject
Firebrick
Caution, warning, danger
danger, wind, Gesture
Salmon
Sports & awards
32px Rounded
32x32
UI
Gnome icons
Emblem, danger
Black