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UI
Outline
ikooni outline: Free Basic
Caution, Error, danger
Black
512x512
Error, Caution, Alert
Glyph
Basic interface
notification, bell, jingle
Linecon
Alert, Clock, time
Alert, Alarm, Clock
Freeline
history, watch, event
Watchify v1.0 - 70px
Alert, warning, bell
Watchify v1.0 - 80px
bell, Alarm, warning
Very Basic. Android L (Lollipop)
problem, Attention, warning
Google Material Design icons
Alert, Battery
Freecns Cumulus
Clock, Alert, time
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Mini icon set Part 1
Alert
48x48
Folder, Alert
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3D
Gnome Web Icons
64, Gnome, Alert
64x64
Smooth
Ultimate Gnome
severe, weather, Alert
256x256
Pixel
Gnome icons
severe, Alert, weather
32x32
Glaze
warning, messagebox, Alert
Crystal Clear
Message, critial, Alert