doubleohfive
Fleet Admiral
I like that they just have Picard call him "Number One", it's something only a first officer should earn.
Well, I think the idea is that subordinate officers have to address a superior officer by rank or by "sir." So "Number One" is an address that only the captain would be permitted to use anyway.
Apparently "Number One" is a traditional Royal Navy address for a first lieutenant/executive officer. It's a title that defines the officer as a deputy or subordinate, so only the person to whom the first officer is subordinate, i.e. the captain, would get to address him or her that way.
Precisely so. Which is why, after Crusher called Riker "Number One" that one time in, I think, "Lonely Among Us" (or was it "The Battle" ?) they never had anyone but Picard use that designation for Riker.