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Signs & symbols
Glyph
Alchemy
Alchemy, Idea, minimal
Black
512x512
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Miscellany Web icons
Idea, light, lightbulb
315x512
Mixed
Social Messaging & Productivity Mix Icons
light, Idea, bulb
506x512
Business & finance
Business and Finance
Idea, brainstorming, imagination
CadetBlue
Business, light, Idea
UI
Very Basic. Android L (Lollipop)
electricity, Light bulb, Idea
Icons Solid
Idea
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Mobile apps
app types in grey
help, Heart, light
DarkSlateGray
PNG MORE
Windows 8 metro style
26x26
WPZOOM Developer Icon Set
Idea, bulb, light
Free Retina Icon Set
brightness, Source, day
60x60
48x48 Free Time Icons
Strike, Idea, light
48x48
Mimi Glyphs
Idea, light
16x16
Windows 8 icons
Duesseldorf
lightbulb, Idea
32x32
Black ToolBar Icons
Idea, lamp, light
40x40
Retina Display Icons
Idea, on, bulb
Silver
64x64
Desktop apps
16x16 Free Toolbar Icons
lamp, light, question
iPhone Toolbar icons
Gray
Ecqlipse 2
Idea, lightbulb
128x128