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UI
Glyph
Blogger
warning
DarkSlateGray
41x41
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Google Material Design icons
Black
512x512
Very Basic. Android L (Lollipop)
problem, Attention, warning
Typicons
Freecns Cumulus
errror, warning, Cloud
warning, Error, Attention
Cloud, warning
Red
warning, Cloud
mark, exclamation, Error
Information, warning
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Windows 8 metro style
shield, warning
Windows 8 icons
26x26