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Social media
Glyph
Twitter UI - Flat
remove, cancel, Block
Black
512x512
Signs & symbols
Web UI
Close, delete, remove
navigation icons
delete, cancel
delete, cancel, cross
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Miscellany Web icons
Mixed
Simple files
stop, Exit, delete
Free Misc Icon Set 1
Exit, delete, Left
Free Misc Icon Set 2
Circle, delete, Minus
Arrows
Navigation Set - Arrows, Part One
delete, remove, cancel
delete, square, Close
Navigation Set - Arrows, Part Two
Circle, Close, delete
Simple Geometric Icons
Exit, delete, Close
iOS7 optimized
Miu
cancel, delete, Circle
Circle, plus, Minus
UI
Google Material Design icons
cancel
Computer & hardware
General
cross, delete, remove
Very Basic. Android L (Lollipop)
cancel, forbidden, no
Material Core
SquareNav
cancel, square, Close
Typicons
Freecns Cumulus
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Business & finance
48x48 Free Time Icons
delete, Close, festive
48x48