The term "Number One" in reference to a ship's first officer is a British naval tradition. So, while a lot of casual viewers might not have been familiar with the term and its meaning, it's not exactly hard to figure out. Just watch an old British war movie or two and it all becomes clear, once the ship's captain starts giving orders to his "Number One".
Besides, if memory serves, "The Making of Star Trek" explains what "Number One" means, and it ain't the alien race explanation.
As for "first officer" and "executive officer", one is a more traditional term, the other is a more modern term, both meaning the exact same position. Again, not exactly deep hidden secrets.
Besides, if memory serves, "The Making of Star Trek" explains what "Number One" means, and it ain't the alien race explanation.
As for "first officer" and "executive officer", one is a more traditional term, the other is a more modern term, both meaning the exact same position. Again, not exactly deep hidden secrets.