"Code" refers to quantity, "foreign" represents "money" and "foreign code" refers to "how much money". Each volume of books and periodicals lists the pricing composed of Arabic numerals (codes) and monetary units (foreign currencies), and multiplies them to get the total pricing, the pricing of a book or the total pricing of a batch of books, and the monetary amount is commonly known as foreign currencies. "Code ocean" is a word used by book publishing and distribution departments to refer to the total price of all books. Code ocean mainly refers to the sum of publication prices, that is, the sum of price * quantity. The book publishing and distribution department refers to the total amount of all books priced. Correspondingly, there is a real ocean, which is a discounted number, that is, a discounted price; The number of copies is the number of books of the same kind. CIP is the cataloging data of books in print. It is the abbreviation of English Cataloguing In publication, which means according to certain standards. In order to compile bibliographic data for books in the publishing process, the bibliographic data printed on the back of the main title page of books generated by cataloging books in print is called in print data.