Somehow related(?) but when I was in Berlin I noticed all buildings have a white square with a black number for the building number. This is consistent across most (all?) parts of the town but no local was able to explain me why or what's the background of that.
Something like this: https://www.google.com/maps/@52.5309649,13.4099152,3a,15y,52...
Anyone knows what's the name of the font (on topic!) and any backstory on those?