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UI
Outline
ikooni outline: Free Basic
Caution, Error, danger
Black
512x512
Error, Caution, Alert
Freeline
warning, flag, notice
Watchify v1.0 - 70px
Alert, warning, bell
Watchify v1.0 - 80px
bell, Alarm, warning
Glyph
Google Material Design icons
warning
Very Basic. Android L (Lollipop)
problem, Attention, warning
Typicons
Freecns Cumulus
errror, warning, Cloud
warning, Error, Attention
Cloud, warning
mark, exclamation, Error
Information, warning
warning, Cloud
Smooth
Snipicons
warning, sign
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Pixel
Bijou
10x10
3D
Crystal Office Collection
warning, 24
24x24
PNG ICO ICNS MORE
Developer Kit
128x128
Fugue Icons
compile, warning
16x16
Tango
warning, Dialog
32x32
Glaze
warning, messagebox, Alert
64x64