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UI
Glyph
Free basic
Accept, checkmark, Check
DarkSeaGreen
512x512
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Photography & graphic design
3D
32x32 Free Design Icons
mark, checking, spell
Black
32x32
Signs & symbols
Free 3d Glossy Interface Icon Set
yes, mark, validation
64x64
checkmark, Accept, Check
LimeGreen
80x80
yes, ok, Check
Lavender
Accept, ready, tick
Pixel
Fugue Icons
document, validation
DarkSlateGray
16x16
validation, invalid
DarkRed
validation, valid
Green
validation
MidnightBlue
validation, invalid, document
html, Label, validation
validation, Label
document, validation, valid
Avatars & smileys
X-mac
validation, input
400x400
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Desktop apps
Free Applications Icons
ok, success, Accept
24x24
Check, good, tick
Check, Accept, green