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UI
Glyph
iOS Tab Bar
complete, done, Circle
Black
512x512
ok, Circle, done
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Elysium Icons
mark, approve, Check
DimGray
24x24
list, todo, Checklist
Blogger
Check
DarkSlateGray
35x35
Free basic
Accept, checkmark, Check
DarkSeaGreen
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Windows 8 metro style
Book, Check
Mimi Glyphs
Check, mark
16x16
Windows 8 icons
26x26
IconSweets
50x50