PNG ICO ICNS SVG MORE
Mixed
Glyph
Flat UI Icons Free
Check, Accept, yes
Black
512x512
PNG MORE
Business & finance
Minicons Free
mark, Check
43x43
Check
44x44
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UI
Mimi Glyphs
Check, mark
16x16
Windows 8 icons
Book, Check
DarkSlateGray
26x26
Windows Metro
48x48
Duesseldorf
Linen
32x32
Retina Display Icons
Check, Alarm
Silver
64x64
Check, Accept, Comment
Desktop apps
16x16 Free Toolbar Icons
ok, tick, Blue
DodgerBlue
Glyph set
yes, ok, Check
160x160
Arrows
DefaultIcon ver 0.11
Check, done
258x258
IconSweets
50x50
Music & multimedia
Iconic