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Signs & symbols
Flat
Circle Icons
hazard, warning, Caution
DimGray
512x512
Attention, danger, Caution
IndianRed
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3D
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Black
64x64
warning, danger, Alert
Prompt, danger, exclamation
Message, help, Prompt
OrangeRed