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UI
Outline
ikooni outline: Free Basic
Caution, Error, danger
Black
512x512
Error, Caution, Alert
Linecon
Alert, Alarm, Clock
Glyph
Very Basic. Android L (Lollipop)
problem, Attention, warning
Freecns Cumulus
warning, Error, Attention
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Free Mobile Icon Kit
Attention, Message
64x64
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3D
Gnome Web Icons
Attention, important
Nuvola
warning, important, Attention
128x128