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Mixed
Flat
Pictograms vol.1
warning, danger, exclamation
CornflowerBlue
137x512
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Things
gold, bell, church
Goldenrod
512x512
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Krispicons- Modern Flat Icons Freebie
Attention, danger, Caution
Firebrick
111x111
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Fire
fire, Alert, warning
Crimson
Toolbar icon set 2
warning
DarkGoldenrod
32x32