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Business & finance
Glyph
Font Awesome
exclamation, Circle
Black
512x512
exclamation
Mixed
Free Misc Icon Set 2
Alert, problem, exclamation
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Files & folders
AwesomeFolders
Folder, Check, exclamation
UI
Freecns Cumulus
mark, exclamation, Error
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24x24 Free Application Icons
stop, Abort, Block
24x24
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Free Mobile Icon Kit
64x64