PNG SVG MORE
Mixed
Glyph
Simple darkcon
problem, warning, Caution
Black
512x512
PNG ICO ICNS SVG MORE
UI
Very Basic. Android L (Lollipop)
problem, Attention, warning
PNG ICO ICNS MORE
Halloween
Photorealistic
Desktop Halloween
Game, creative, silence
256x256
Holiday, problem, warning
DarkSlateGray
pet, catty, danger
Devil, problem, Account
Gaming & gambling
3D
Free Game Icons
satan, red, evil
64x64
Avatars & smileys
Free Large Boss Icon Set
fire, evil, god
Red
Photography & graphic design
32x32 Free Design Icons
problem
32x32
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Business & finance
Pixel
24x24 Free Pixel Icons
24x24
24x24 Free Application Icons
Attack, Error, Alert
Network & communications
16x16 Free Application Icons
16x16
Signs & symbols
Free 3d Glossy Interface Icon Set
Attention, Error, cautious
warning, danger, Alert
Prompt, danger, exclamation
Message, help, Prompt
OrangeRed
Prompt, help, danger
Desktop apps
16x16 Free Toolbar Icons
problem, warn, danger
Gold
Free Applications Icons
Message, Attention, exclamation
Alert, hanger, warning
danger, Message, Attention
Goldenrod