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Signs & symbols
Glyph
Outline style
Alert, Message, Alarm
Black
512x512
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Buttons
Burn, Alert, warning
Mixed
Basic icon element
danger, warning, safety
Free Misc Icon Set 2
Alert, problem, exclamation
Error, sign, fill
Error, Alarm, warning
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Web Icons
Alert, ring, notification
UI
Basic interface
notification, bell, jingle
Simple darkcon
problem, warning, Caution
Very Basic. Android L (Lollipop)
problem, Attention, warning
Google Material Design icons
Alert, Battery
Network & communications
Communication & Technology
wave, Attention, Error
Octicons
Alert
Freecns Cumulus
Clock, Alert, time
Computer & hardware
Ionicons
Alert, Circled
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Business & finance
48x48 Free Time Icons
warning, medicine, siren
48x48
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24x24 Free Application Icons
stop, Abort, Block
24x24
Mini icon set Part 1
Folder, Alert
Arrows
DefaultIcon ver 0.11
256x256
