I'm looking for any references, information and examples of logotypes that include underlined like-ordinals characters (mostly a and o). I'm quite sure I've seen those on older buildings from the beginning of twentieth century. I am assuming that it has something to do with Art Deco and maybe what had come right next after it. But all I have found was one image of a rich family's tombstone in Prague (attached).
(I'm sorry, but I can't come up with a better title.)