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Signs & symbols
Glyph
Web UI
Checkbox, confirm, Approved
Black
512x512
Business & finance
Font Awesome
O, Check, square
O, Check, Calendar
Check, Circle, O
Check, Circle
square, Check
Check
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Arrows
Developer Set
Check, Checklist, list
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Miscellany Web icons
approve, Check, list
448x512
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Buttons
Cloud, tick, ok
normal, ok, Check
YellowGreen
Computer & hardware
Database Management
Check, network, Database
DimGray
Mixed
Simple files
success, Accept, Check
Free Misc Icon Set 1
good, Check, ok
ok, Accept, Checklist
Navigation Set - Arrows, Part One
done, Check, check circle
done, Check, square
Navigation Set - Arrows, Part Two
yes, Check, ok
Network & communications
Cloud Computing
Check, Accept, ok
DarkSlateGray
UI
iOS Tab Bar
complete, done, Circle
ok, Circle, done
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Elysium Icons
mark, approve, Check
24x24
list, todo, Checklist
Blogger
35x35