AFAICT this room is not shown on any site. I suppose the other room would be shown in the sidebar of Meta Stack Exchange - since it is associated with that site.
Ok, I thought I just throw out this suggestion. OTOH there are a few users who know about this room and occasionally come here (most recently Monica Cellio).
I'll wait a bit to see whether somebody else picks up on the idea of a new room. (Although since this room is seldom visited, that does not seem that likely.)
When I have a bit of time and an actual question to ask, I might try to create a new room associated with Meta Stack Exchange. (It would probably make no sense to simply create new room if there is nothing to discuss in there.)