PNG ICO ICNS SVG MORE
Signs & symbols
Glyph
Web UI
Keyboard, Key, Apple
Black
512x512
Business & finance
Font Awesome
Key
Bold Purple (Free Samples)
Key, navigation, Enter
PNG SVG MORE
Emergency signs
Code, sos, Key
LimeGreen
503x512
PNG ICO SVG MORE
Tools & construction
Hand tools
Key, tool
Miscellany Web icons
Protection, security, Key
434x512
Computer & hardware
Data icons
Flash, Key, Usb
Network & communications
Cloud Computing
password protect, Key, Lock
DarkSlateGray
PNG MORE
UI
Elysium Icons
Key, login, sign in
DimGray
24x24
GlyphPack
Blogger
38x38
Google Material Design icons
Key, Vpn
Very Basic. Android L (Lollipop)
secure, protect, Key
PNG ICO ICNS MORE
Mixed
Simple Icons
Key, Lock
Iconico
Code, password, locked
1024x1024
Icons Solid
Mobile apps
app types in grey
rent-a-car, Car, Key
shopping website
locked, Key, key lock
256x256
Octicons
448x512
Typicons
FatiCons
Freecns Cumulus