hl. m. Praha
Apparently “hl. m.” stands for Capital City. When someone writes “hl. m. Praha” instead of just “Praha”, what meaning are they adding? What are they trying to emphasize? Do these terms refer to something different, like London and Greater London?
It is usually in connection with something legal or with the magistrate (city council) or with the services provided by them. It is in the name of various institutions connected with the magistrate.
It is to also to distinguish it from all the individual numbered city parts which have their own city councils.
It does also include several villages which belong to Prague now. These all also belong to one of the numbered parts.