What's a good icon to represent a legend or a key for a diagram?

Posted by Bears will eat you on Stack Overflow See other posts from Stack Overflow or by Bears will eat you
Published on 2010-04-06T19:13:16Z Indexed on 2010/04/06 19:23 UTC
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web-design

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ui

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icon

I'm implementing a small web app widget that shows a legend/key for a diagram (or chart/map/graph/whatever), but only during mouseover of the widget. It's basically just going to be a div with a background image. What would be a good icon that communicates "I show the legend" or "I am the legend" to the unfamiliar users? I'm looking for something in the 10x10 to 20x20 pixel range.

Assuming that a legend is the same thing as a key (is it?) then I could use a small icon of a key (like you'd unlock a door with) but that seems cheesy or unclear at worst. I'm not sure that's really the clearest way to do it. Is there an icon that should instantly remind users of a legend?

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