Bookmobile has useful post discussing the various parts of a hardcover book. For those who can never remember which is which this will be useful.
I always used to say that we production folks got more respect than we really deserved because we dealt in a vocabulary by which other departments were bewildered. Our jargon put up a screen behind which others sensed great complexity. They were wrong of course; behind the curtain was just an ordinary man from Omaha in a green suit. “Pay no attention to that man behind the curtain” remain words to live by.