I am reformatting a mobile web map. Many of our users are equipped with mobile phones rather than large tablets, so screen real estate is at a premium. I've decided to remove the legend from default view for these devices. Users will have to click on or hover over a small control button to view the legend.
So naturally, I now need a symbol that conveys "legend" to place on the control button. Leading candidates:
- A key: intuitive, but it says "key" more than "legend". A difference many users might not care about, but I do...
- A question mark: it's engaging and implies it can answer questions about the map.
- The word "legend". This is a last resort. The other control buttons have icons, so this would kind of throw a wrench in the works, but it definitely conveys the concept of a legend.
I'm not completely satisfied with any of these, which is why I've come to you. What says legend without saying legend?