PNG ICO ICNS SVG MORE
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
PNG SVG MORE
Miscellany Web icons
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Buttons
delete, Block, Clear
Firebrick
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
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UI
Round UI Buttons
Exit, delete, Close
Tomato
dismiss, cancel, remove
OliveDrab
Simple Geometric Icons
iOS7 optimized
Miu
cancel, delete, Circle
Circle, plus, Minus
PNG MORE
Elysium Icons
cross, cancel, remove
DimGray
24x24
Google Material Design icons
cancel
Computer & hardware
General
cross, delete, remove
Very Basic. Android L (Lollipop)
cancel, forbidden, no
Material Core
Free basic
cancel, Not, stop