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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
Smooth
Farm-fresh
Price, Alert
DarkSeaGreen
32x32
Glyph
16x16 Free Toolbar Icons
nell, Alert, time
LightCyan
16x16
problem, warn, danger
Gold
Web Cartoon
Alert, warning
Orange
48x48
Marker-Style Icons
Alert
64x64
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3D
Free Applications Icons
Hand, Block, stop
Red
24x24
Message, Attention, exclamation
OrangeRed
Alert, exclamation, General
Tomato
Alert, hanger, warning
warning, ban, Block
danger, Message, Attention
Goldenrod
One bit
exclamation, Alert, notice
DarkGoldenrod
Alert, Information
Pixel
Diagona Icons
Attention, Alert, exclamation
Splashyfish
Alert, Comment
DarkGray
Error, Attention, exclamation