Bestseller

A bestseller was any book that sold a large number of copies.

In 2369, Julian Bashir opined that if Vash wrote a book about the Gamma Quadrant, it would be a bestseller on Deep Space 9. (DS9: "Q-Less")

In 2372, during Quark's dream, Grand Nagus Gint assured him that the Rules of Acquisition were important, hence their bestseller status. (DS9: "Body Parts")

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