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Signs & symbols
Glyph
Miscellany Web icons
Idea, light, lightbulb
Black
315x512
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Mixed
Free Misc Icon Set 2
power, bulb, lamp
512x512
Social Messaging & Productivity Mix Icons
light, Idea, bulb
506x512
Business & finance
Business and Finance
Idea, brainstorming, imagination
CadetBlue
Business, light, Idea
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Mobile apps
app types in grey
help, Heart, light
DarkSlateGray
Octicons
bulb, light
UI
Freecns Cumulus
WPZOOM Developer Icon Set
Idea, bulb, light
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Black ToolBar Icons
Idea, lamp, light
40x40
Retina Display Icons
Idea, on, bulb
Silver
64x64
light, bulb, off
Desktop apps
16x16 Free Toolbar Icons
lamp, light, question
16x16