Initially I thought that Meta Stack Overflow was the common meta for all SE sites.
Then I noted that English Language and Usage has its own meta site.
It took a while for me to learn that even Server Fault has its own meta site.
Looking at my reputation points, I see difference between Stack Overflow and Meta Stack Overflow, but not between the other sites and there corresponding meta sites.
Now, is Meta Stack Overflow in some sense the master meta site of all or not?