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Signs & symbols
Glyph
Outline style
Add, plus, new
Black
512x512
navigation icons
delete, cancel, cross
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Miscellany Web icons
plus, Circle, zoom
491x512
Mixed
Free Misc Icon Set 2
plus, Add, new
Arrows
Navigation Set - Arrows, Part One
delete, remove, cancel
delete, square, Close
UI
iOS Tab Bar
delete, remove, cross
cross, multiply, cricle
Simple Geometric Icons
Exit, delete, Close
Social Messaging & Productivity Mix Icons
Close, logout, remove
download, Downloads, Cloudy
Computer & hardware
General
cross, delete, remove
Very Basic. Android L (Lollipop)
cross, delete, Close
SquareNav
cancel, square, Close
Social media
Black Socicons
cross
Typicons
Flat UI Icons Free
cross, remove, delete
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Business & finance
Black ToolBar Icons
x, remove, cross
40x40
DefaultIcon ver 0.11
Exit, Bbcancel, Close
258x258