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Signs & symbols
Glyph
Outline style
Add, plus, new
Black
512x512
Mixed
Bold Blue Glyphs (Free Samples)
remove, office, Folder
LightSkyBlue
cross, Circle, delete
navigation icons
delete, cancel, cross
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Emergency signs
cross, sos, sign
Gold
emergency, green, Code
LimeGreen
509x512
Miscellany Web icons
plus, Circle, zoom
491x512
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Buttons
delete, Block, Clear
Firebrick
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
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Elysium Icons
delete, Application, cross
DimGray
24x24
cross, cancel, remove
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
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Mobile apps
app types in grey
plus, cross, Add
DarkSlateGray