What does a book number mean?
A book number was usually a book numbering system consisting of a string of numbers and letters. Different publishing houses and book types might have different book number format and rules. The function of the book number was to distinguish different types of books and facilitate the distribution and sales of books. For example, a large publishing house might have many types of books, and each book might have a different book number. The book number could also be used to identify the copyright information of the book, such as the author, the publishing house, the publication date, and so on. A book number usually consisted of three parts: the first two digits were numbers to identify the publishing house, the middle two were letters to identify the type of book, and the last two were numbers and letters to identify the specific book number. For example," IsBN978 -7-5449-0012-8 " represented a book called " Harry Potter and the Sorcerer's Stone."
