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UI
Glyph
GlyphPack
Key
Black
512x512
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Google Material Design icons
Key, Vpn
Very Basic. Android L (Lollipop)
secure, protect, Key
Typicons
Freecns Cumulus
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Windows 8 metro style
Free Mobile Icon Kit
Key, refresh
64x64
Mini icon set Part 1
48x48
Ecqlipse 2
128x128