"Legends" is not referring to like, legendary or epic. Or to stories. If you Google search images for "map legend" you'll see. The legends tell you what certain symbols or colors mean. The colors in this forum explain the people here and their roles. For example, the admins and moderators' colors are dark purple. You can't really tell that they're moderators (since everyone has colored names) but if you look at the legend, it tells that people with dark purple colored names are admins or moderators. The other colors tell who is who. People change their name a lot here on the forum so their basic name is put down there. Ex: Marceline is now Mnsgoku. You can see that her name color matches her original name on the legend. Now you know for sure that's her.
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I hope this helped a bit.