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Business & finance
Glyph
Font Awesome
ban
Black
512x512
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Signs & symbols
Buttons
Block, ban, Adware
Firebrick
UI
GlyphPack
Mixed
Icons prohibition
prohibition sign, impossible, prohibition
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48x48 Free Time Icons
Abort, exclamation, Up
Tomato
48x48
warning, Alert, Hand
Red
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24x24 Free Application Icons
stop, Abort, Block
24x24
Error, sign, Blocked