This is a font showcasing most of the FS stock bricks being inverted. The only ones that havent been are:
Polygons 1, 2, and 3;
Macaroni Quarters 1, 2, 3 and 4;
Macaroni Eighths 1, 2, 3 and 4;
New Rings 1 through 7;
and all of the Connect Bricks.
Bricks are sorted by starting letter. Inside the letters, there are different categories based on how many bricks the inversion uses.
As you can see, lots of characters are missing. I'm currently too lazy to make a guess on the characters I don't know (apart from B, L, U, and 0, which may be important in some common floor numberings. And -, but that should be pretty easy). As you can see, the numbers of this font greatly resemble the KONE KSS font.