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Healthcare & medical
Flat
Firefighter
Extinguisher, Fire extinguisher, warning
DarkSlateGray
512x512
fire, danger, fire alarm
LightBlue
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Mixed
Things
gold, bell, church
Goldenrod
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Krispicons- Modern Flat Icons Freebie
Attention, danger, Caution
Firebrick
111x111
Fire
fire, Alert, warning
Crimson
Mobile apps
Hex ICO
warning
128x128
Files & folders
small-n-flat
warning, shield
Black
Business & finance
Pretty Office 9
warning, File
Gainsboro
256x256
Toolbar icon set 2
DarkGoldenrod
32x32