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Signs & symbols
Glyph
Bold Purple (Free Samples)
security, Unlocked, Blocked
MediumOrchid
512x512
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Miscellany Web icons
padlock, security, protect
Black
371x512
Mixed
Free Misc Icon Set 2
Lock, privacy, off
Entypo
padlock
421x512
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UI
iPhone Toolbar icons
Gray
26x26
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Arrows
DefaultIcon ver 0.11
Closed, padlock
256x256
open, Unlocked, padlock
Business & finance
Wireframe mono icons
padlock, open, Unlocked
48x48
Closed, Fixed, Lock