PNG SVG MORE
Signs & symbols
Glyph
Miscellany Web icons
delete, cancel, cross
Black
512x512
PNG ICO MORE
Buttons
Error, Lock, Clear
Firebrick
PNG ICO ICNS SVG MORE
Mixed
Basic icon element
danger, warning, safety
Free Misc Icon Set 2
Error, sign, fill
Error, Alarm, warning
Network & communications
Cloud Computing
rejected, Cloud computing, sign
DarkSlateGray
Simple darkcon
warning, Error, skull
324x512
Material Core
Error
UI
Google Material Design icons
Communication & Technology
wave, Attention, Error
PNG ICO ICNS MORE
Windows 8 metro style
Freecns Cumulus
warning, Error, Attention
mark, exclamation, Error
Business & finance
48x48 Free Time Icons
Abort, exclamation, Up
Tomato
48x48
PNG MORE
24x24 Free Application Icons
24x24
stop, Abort, Block
Attack, Error, Alert
Error, sign, Blocked
Red
Windows 8 icons
26x26
Desktop apps
16x16 Free Toolbar Icons
problem, warn, danger
Gold
16x16
