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UI
Outline
Linecon
tick, success, yes
Black
512x512
Freeline
ok, yes, tick
ikooni outline: Free Basic
checkmark, Check, complete
Glyph
Typicons
tick
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Pixel
Bijou
10x10
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3D
Gnome Web Icons
yes, ok, tick
64x64
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Gnome icons
tick, Checkbox, Form
24x24