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Photography & graphic design
3D
32x32 Free Design Icons
cross, red, cancel
Black
32x32
no entry, no, cancel
Signs & symbols
Free 3d Glossy Interface Icon Set
Hand, warning, Abort
64x64
Computer & hardware
FS Icons Ubuntu
save, gtk, cancel
512x512
UI
Gloss Basic Icons
cancel
Mixed
Vista Style Base Software
cancel, red
256x256
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Desktop apps
Free Applications Icons
warning, ban, Block
24x24