About [[EOL:Website-admin content page edit tip/en]]
Fragment of a discussion from Translating talk:Encyclopedia of Life/LiquidThreads
It's a Rails-specific term which means that in order for a URL like "eol.org/some_route" to work, "some_route" needs to be defined in one of the hard-coded config files.
So, essentially, it's a URL route with a specific name.