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What sort of icon/graphic could represent 'concept'?

It would be very helpful as a place-holder when I am making basic sketches and notes.

Third Party Edit (from comments):

hhajemi (OP): From my experience, I will normally try to clarify some key concepts in the areas of interest and the following discussions will be based/built/developed upon these concepts. Than the light bulb or CFL (thanks koiyu for sharing this) moment, I can use a "brick" or "jigsaw" piece to represent a concept. I believed that this is not original but I think it can serve the purpose. Thanks all for commenting.

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what concept you want to represent?? – Jack May 25 '11 at 7:40
@Jack: I'm assuming he means he wants to represent the concept of a concept. – PearsonArtPhoto May 25 '11 at 14:53
@hhajmi - can you confirm? – UpTheCreek May 26 '11 at 6:43

A concept can be an idea, in that case you can go for the regular light bulb.

It could also mean a path, a structure, maybe you could use a blue print, drawing board.

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… or tabula rasa, which would be, well, blank. Rather dull for a symbol. +1 for a light bulb—if you want to be more 2010, draw a CFL! – koiyu May 25 '11 at 13:11
LOVE the CFL idea! :-D – Alan Gilbertson May 25 '11 at 20:09
I think Honda has used the CFL in a commercial. It'll become more common as more localities ban incandescents. – Ray Mitchell May 25 '11 at 23:21

A comic strip style "thought bubble" may also be a way to express concept.

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