I think this is on-topic for qalam, though extended discussions of it
may be better placed on vellum (which I have not subscribed to; someone
forward this there).
http://www.artlebedev.com/mandership/105/
A discussion of the development of the Russian keyboard and its peculiar
uppercase comma. There looks to be a lot of other interesting stuff in
this sequence of numbered pages, waiting to be found...
~mark