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.

  • 2
    what concept you want to represent??
    – Jack
    Commented May 25, 2011 at 7:40
  • 1
    @Jack: I'm assuming he means he wants to represent the concept of a concept. Commented May 25, 2011 at 14:53
  • @hhajmi - can you confirm?
    – UpTheCreek
    Commented May 26, 2011 at 6:43

2 Answers 2


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.

  • 3
    … 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! Commented May 25, 2011 at 13:11
  • 1
    LOVE the CFL idea! :-D Commented May 25, 2011 at 20:09
  • I think Honda has used the CFL in a commercial. It'll become more common as more localities ban incandescents. Commented May 25, 2011 at 23:21

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


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