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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
Gray
Alert, Folder
DarkGray
Smooth
All Google icons
O, Alert
DarkOrange
128x128
Alert, B
DodgerBlue
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Pixel
Sketchdock Ecommerce Icons
Alert, grey, square
LightSteelBlue
24x24
Alert, square, Blue
RoyalBlue
square, red, Alert
Crimson
grey, triangle, Alert
triangle, exclamation, Alert
Alert, triangle, Blue
3D
Gnome Web Icons
severe, Alert, Gnome
DimGray
32x32