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Desktop apps
Outline
Minicons
Alert, Prompt, Attention
Black
512x512
Confirmation, Box, Alert
Alert, White, warning
Attention, Box, Confirmation
warning, Alert, Dialog
Dialog, Prompt, Box
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Handdrawn
Sketchy Icons v 1.2
Copy, red, Alert
256x256
Marker-Style Icons
Alert
64x64
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3D
Free Applications Icons
Alert, hanger, warning
24x24
warning, ban, Block
Pixel
Splashyfish
notice, Alert, triangle
16x16