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Business & finance
Glyph
Font Awesome
O, lightbulb
Black
512x512
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Signs & symbols
Miscellany Web icons
Idea, light, lightbulb
315x512
Mixed
Glypho - Free
lightbulb
UI
GlyphPack
off, lightbulb
471x512
355x512
Typicons
Iconic
DarkSlateGray
320x512
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Duesseldorf
lightbulb, Idea
32x32
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iPhone Toolbar icons
Gray
26x26
Wireframe mono icons
48x48
Music & multimedia
20x32
Ecqlipse 2
Idea, lightbulb
128x128