The other sites official names are: Stack Overflow, Server Fault and Super User.
Update 2: the official name is Meta Stack Overflow, despite the consensus here of Meta StackOverflow - this is directly from Jeff Atwood. MSO is the abbreviation.
Which of the following is this site's official name?
- Meta Stack Overflow
- Meta StackOverflow
- meta StackOverflow
- meta Stack Overflow
- meta stack overflow
What is the corresponding official abbrevation (SO, SF and SU for the others):