A "centerline indicator" above a urinal

This is a Canadian accessibility requirement in men's public bathrooms.

6.2.8.3 Centreline indicator The centreline of a urinal shall be indicated by a vertical element that (a) is centred on the urinal; (b) extends to a height of at least 1300 mm from the floor, but never less than 150 mm above the upper urinal rim; and (c) is at least 50 mm wide; (d) is raised at least 3 mm from the wall surface; and (e) is colour-contrasted not less than 70% with the back wall.

Discussion thread at the Ottawa subreddit.  Photo via whatisthisthing.  Some relevant discussion (and a lot of snark) at each link.