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UI
Glyph
iOS Tab Bar
complete, done, Circle
Black
512x512
ok, Circle, done
GlyphPack
Circle, checkmark
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square, checkmark
checkmark
Very Basic. Android L (Lollipop)
done, check mark, good
Free basic
Accept, checkmark, Check
DarkSeaGreen
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Windows 8 metro style
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Windows 8 icons
DarkSlateGray
26x26