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UI
Outline
Linecon
tick, success, yes
Black
512x512
Freeline
ok, yes, tick
ikooni outline: Free Basic
checkmark, Check, complete
Watchify v1.0 - 70px
Affirmative, yes, check mark
Watchify v1.0 - 80px
yes, check mark, success
Glyph
Very Basic. Android L (Lollipop)
Checked, Accept, yes
done, check mark, good
ok, Accept, Choose
PNG ICO MORE
3D
Gnome Web Icons
yes, ok, tick
64x64
PNG ICO ICNS MORE
Smooth
Ultimate Gnome
ok, yes, Check
256x256
Pixel
Lynx Black
yes, gtk
24x24
Crystal Clear
on, select, correct
128x128
ok, good, yes