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Signs & symbols
Outline
User interface
Alert, warning, Attention
Black
512x512
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Glyph
Buttons
Alert, reminder, notification
Teal
support, help, Alert
Flat
Circle Icons
Attention, danger, Caution
IndianRed
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3D
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
64x64
Hand, warning, Abort
warning, danger, Alert
Prompt, danger, exclamation
Message, help, Prompt
OrangeRed
Prompt, help, danger