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UI
Glyph
Round UI Buttons
Exit, delete, Close
Tomato
512x512
dismiss, cancel, remove
OliveDrab
dismiss, delete, Close
DeepSkyBlue
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Elysium Icons
cross, cancel, remove
DimGray
24x24
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Google Material Design icons
Close
Black
Very Basic. Android L (Lollipop)
cross, delete, Close
Free basic
cancel, Not, stop
Firebrick
Clear, cancel, decline
Windows 8 metro style
window, Close
DarkSlateGray
Free Mobile Icon Kit
Close, window
64x64
Mimi Glyphs
delete, Close
16x16
Windows 8 icons
26x26
Mini icon set Part 1
48x48
DarkGray