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Signs & symbols
Glyph
Web UI
Keyboard, Key, Apple
Black
512x512
Bold Purple (Free Samples)
Key, navigation, Enter
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Emergency signs
Code, sos, Key
LimeGreen
503x512
Miscellany Web icons
Protection, security, Key
434x512
Flat
Circle Icons
security, Key
SandyBrown
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Smooth
Two Tone Design Set
security, secure, password
DarkSlateGray
128x128
Super Mono Basic
green, Basic, Key
48x48
red, Key, Basic
Key, Basic, yellow
Basic, Key, Blue
3D
Must Have
Key, password
256x256
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34aL volume 3.2 SE
password, Lock, secure
DodgerBlue
24x24
Key, Access, password