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UI
Glyph
Round UI Buttons
Circular, Accept, Go
Tomato
512x512
ok, tick, yes
OliveDrab
tick, yes, Go
DeepSkyBlue
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iOS Tab Bar
complete, done, Circle
Black
ok, Circle, done
Very Basic. Android L (Lollipop)
Checked, Accept, yes
done, check mark, good
ok, Accept, Choose
Free basic
Accept, checkmark, Check
DarkSeaGreen
Windows 8 metro style
ok
DarkSlateGray
Free Mobile Icon Kit
ok, smile
64x64
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Windows 8 icons
26x26