Submitted by themaysooproject, who says:

A rather odd way of showing the same line going in two different directions. This layout suggests there are two different lines, splitting in two separate branches from the current station. This photo was taken at Amstelveenseweg metro station, Amsterdam. It’s part of the new route signage.

Transit Maps says:

This certainly is a peculiar way to indicate travel in two completely opposite directions from the one station, and I’m guessing it’s been done because of physical space limitations on the signage. As Amstelveensewag only has a single island platform, I don’t actually see this diagram causing too many problems in this instance… but I’d be interested to see how (or if) it works at a more complex interchange station.