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Mixed
Handdrawn
Social Messaging & Productivity
danger, Attention, Error
Black
512x512
UI
Glyph
Very Basic. Android L (Lollipop)
problem, Attention, warning
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Files & folders
AwesomeFolders
Folder, Check, exclamation
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Computer & hardware
Outline
Mirrored Twins (hollow)
sign, Caution, warning
Desktop apps
Minicons
Alert, Prompt, Attention
Confirmation, Box, Alert
Alert, White, warning
Attention, Box, Confirmation
warning, Alert, Dialog
Dialog, Prompt, Box
Network & communications
Communication & Technology
wave, Attention, Error
Freecns Cumulus
warning, Error, Attention
Halloween
Photorealistic
Desktop Halloween
user, kill, Caution
256x256
Gaming & gambling
3D
Free Game Icons
warning, Blaze, Attention
64x64
48x48 Free Object Icons
Alert, fire, combust
48x48
Free Mobile Icon Kit
Attention, Message
Signs & symbols
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
Hand, warning, Abort
warning, danger, Alert
Prompt, danger, exclamation
Prompt, help, danger
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Gnome Web Icons
Attention, important
Smooth
Humility
Attention, Emblem, important
32x32
DelliOS System Icons
grey, Attention