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Signs & symbols
Glyph
Web UI
Checkbox, confirm, Approved
Black
512x512
Outline
User interface
Accept, success, user interface
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Miscellany Web icons
approve, Check, list
448x512
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Buttons
Cloud, tick, ok
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3D
Free 3d Glossy Interface Icon Set
yes, mark, validation
64x64
Must Have
yes, ok, positive
256x256