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Retro items
Alarm, timer, Error
DarkSlateGray
512x512
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Signs
Flat
Computer security set
notice, Signaling, warning
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Halloween
Photorealistic
Desktop Halloween
Holiday, problem, warning
256x256
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Business & finance
Glyph
24x24 Free Application Icons
Attack, Error, Alert
24x24
Mixed
Pixel
PixeloPhilia
Alert, Attention, exclamation
32x32