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Business
question, question mark, Confused
Black
512x512
PNG ICO ICNS MORE
Halloween
Photorealistic
Desktop Halloween
Connection, insects, spider's web
256x256
Gaming & gambling
3D
Free Game Icons
secure, Authentication, password
64x64
Network & communications
Pixel
16x16 Free Application Icons
secure, Log in, pass
16x16
Key, Log in, login
Lock, security, pwd
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Desktop apps
Free Applications Icons
Lock, clef, private
24x24
Log in, private, password
Key, private, login