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UI
Glyph
Very Basic. Android L (Lollipop)
problem, Attention, warning
Black
512x512
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Mixed
Material Core
sign, warning
Geomicons
warning
Network & communications
Communication & Technology
wave, Attention, Error
Computer & hardware
3D Maker Vol 1
sign, Attention, warning
Goldenrod
Cog, Attention, warning
Crimson
Typicons
Freecns Cumulus
errror, warning, Cloud
warning, Error, Attention
Cloud, warning
Red
warning, Cloud
mark, exclamation, Error
Information, warning
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Business & finance
48x48 Free Time Icons
warning, medicine, siren
48x48
war, Military, danger
DarkSlateGray
Abort, exclamation, Up
Tomato
anxiety, Alert, hospital
warning, Alert, Hand