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Signs & symbols
Smooth
Super Mono Basic
Basic, Unlock, yellow
Black
48x48
Basic, yellow, Lock
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UI
Pixel
Bijou
Lock
8x10
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Mixed
3D
Webtoys
SandyBrown
64x64
Blueberry
SkyBlue
32x32
Computer & hardware
Strabo
Lock, Unlocked
Gray
24x24
Goldenrod
Windows 8 Pack (Metro Style)
DarkSlateGray
26x26
Gloss Mac Sampler
search, zoom, Lock
512x512
Music & multimedia
Soft media icons vol 1
Business & finance
Glyph
Jigsoar
Social + Tabs Color: Free
open, Lock
40x40
Shopping & e-commerce
Shop Icons
256x256
My Secret
Key, Lock
128x128
Handdrawn
Hand Drawn Web Icon Set
locked, Lock, secure
Unlocked, Lock, padlock
Desktop apps
Windows 7 toolbar full
Super Mono Stickers
Unlock, Lock
Lock, sticker
Super Mono Reflection
Lock, Blue, Unlock
DeepSkyBlue
Lock, Blue
green, Lock