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Business & finance
Glyph
Font Awesome
warning
Black
512x512
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48x48 Free Time Icons
warning, medicine, siren
48x48
war, Military, danger
DarkSlateGray
Abort, exclamation, Up
Tomato
anxiety, Alert, hospital
Red
warning, Alert, Hand
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24x24 Free Application Icons
Goldenrod
24x24
stop, Abort, Block
Attack, Error, Alert
Error, sign, Blocked