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Signs & symbols
Smooth
Two Tone Design Set
Unlock, password, security
Chocolate
128x128
Super Mono Basic
Unlock, Basic, Blue
Black
48x48
Unlock, Basic, green
red, Unlock, Lock
Crimson
Basic, Unlock, yellow
Music & multimedia
Soft media icons vol 1
Unlock
Silver
32x32
Desktop apps
Windows 7 toolbar full
search, secure, Unlock
256x256
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UI
Super Mono Stickers
Unlock, Lock
64x64
Shopping & e-commerce
Super Mono Reflection
Lock, Blue, Unlock
DeepSkyBlue
yellow, Unlock, Lock
Mixed
Bunch of Bluish Icons
512x512
Simplicio
security, Unlock
Orange
Business & finance
Primo
Lock, Unlock
DarkSlateGray
Mac OS X style
Unlock, Blue unlock
Ginux
Keys, Unlock
LightSlateGray
One bit
DarkGray
User Interface Icons
Unlock, File
LightSteelBlue
80x80
Unlock, Folder
SandyBrown
Gold
Unlock, user
Lavender
Computer & hardware
Crystal Project
Futurosoft
Network & communications
Oxygen
Log in, password, Lock
Tan