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Signs & symbols
Glyph
Web UI
Close, delete, remove
Black
512x512
Outline style
Resize, exit fullscreen, Exit
navigation icons
delete, cancel, cross
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Solid line essential UI icon set
Essential, set, x
Mixed
Basic
Basic, Close, x
Simple files
stop, Exit, delete
Business & finance
Free Misc Icon Set 1
Delivery, Shipping, Close
Exit, delete, Left
Arrows
Navigation Set - Arrows, Part One
delete, remove, cancel
delete, square, Close
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iconnice vector icon
Close
459x512
Navigation Set - Arrows, Part Two
Circle, Close, delete
Simple Geometric Icons
Exit, delete, Close
iOS7 optimized
Miu
Trash, Circle, remove
Trash, Circle, Close
UI
Google Material Design icons
Virtual Notebook
x mark, Close
Social Messaging & Productivity Mix Icons
handrawn, safety, open
501x512
Close, logout, remove
open, remove, Folder
Computer & hardware
General
cross, delete, remove
Very Basic. Android L (Lollipop)
cross, delete, Close
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Simple Icons
Material Core