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Desktop apps
Outline
Minicons
Alert, White, warning
Black
512x512
warning, Alert, Dialog
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Smooth
Farm-fresh
warning, compile
32x32
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3D
Free Applications Icons
Alert, hanger, warning
24x24
warning, ban, Block
Pixel
Splashyfish
notice, Alert, triangle
16x16
KDE Crystal Diamond
messagebox, warning
22x22