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Business & finance
Glyph
48x48 Free Time Icons
warning, medicine, siren
Black
48x48
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24x24 Free Application Icons
stop, Abort, Block
24x24
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Outline
iOS 7 icons
flag, Alert
512x512
3D
E-commerce & business icons
Alert
256x256
Shimmer Icons
warning, Alert
Plastic XP
Alert, emergency
400x400
Phuzion
128x128