What does "NN" mean (submitting a proposal to a publisher)? I recently heard about the possibility of submitting a proposal for a book to the publisher as "NN". I assume it has something to do with the fact that a couple of possible contributors have not yet confirmed their contribution but the editors want to go ahead anyway and submit the proposal already.

Am I right with my assumption? If so, what does "NN" stand for?
Nomen nominandum, "a name to be named" - if you don't know the person's name yet, this indicates that you will supply the name later.

Which sounds a bit more reassuring than a simple nomen nescio, "I don't know the name".