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UI
Outline
Linecon
cross, remove, delete
Black
512x512
Glyph
Google Material Design icons
Close
remove, Minus, less
Freeline
delete, remove, Close
cross, Exit, delete
ikooni outline: Free Basic
Close, cancel, Exit
Very Basic. Android L (Lollipop)
cross, delete, Close
Round Black Icons
Minus, Trash, remove
Smooth
Snipicons
Eye, Close
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Free Mobile Icon Kit
Close, window
64x64
Mimi Glyphs
delete, Close
16x16
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3D
Gnome Web Icons
window, Close, Gnome
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Crystal Office Collection
Close, 24
24x24
Ultimate Gnome
Close, gtk
256x256
Pixel
Gnome icons
Close, node, path