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Signs & symbols
Glyph
Miscellany Web icons
delete, cancel, cross
Black
512x512
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Mixed
Basic icon element
danger, warning, safety
Free Misc Icon Set 2
Error, sign, fill
Error, Alarm, warning
Simple darkcon
warning, Error, skull
324x512
Material Core
Error
UI
Google Material Design icons
Network & communications
Communication & Technology
wave, Attention, Error
Freecns Cumulus
warning, Error, Attention
mark, exclamation, Error
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Business & finance
24x24 Free Application Icons
stop, Abort, Block
24x24