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Signs & symbols
Glyph
Web UI
customize, Gear, preferences
Black
512x512
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Miscellany Web icons
settings, configuration, cogwheel
449x512
Mixed
Glypho - Free
settings, Cog
Geomicons
Guide, Cog
Cog
UI
Typicons
Computer & hardware
Ionicons
WPZOOM Developer Icon Set
Cog, Gear
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IcoMoon
32x32
Business & finance
Wireframe mono icons
48x48
Music & multimedia
Iconic
Token
128x128