The international label of books refers to the unique identification symbol of books, also known as ISBN code. This specification is formulated by the International Organization for Standardization (ISO), which can help libraries, booksellers and other related institutions to accurately identify and manage books. ISBN code consists of 13 digits, of which the last digit may be "X", representing the number "10". Each book has its own unique ISBN code, which helps consumers to buy books and manage stacks.

The international label of books not only contributes to the management of books, but also contributes to the development of book industry. With ISBN code, the production, sale and collection of books can be carried out more accurately and quickly. By inputting ISBN code, consumers can quickly find out the sales channels and prices of the books they need, and also know the publishing house, author, publication date and other information of the books. In addition, ISBN code also facilitates the transnational sales of books.

International book labeling is an important part of modern book industry and a necessary means to promote book standardization and informatization. With the popularity of the Internet and the rise of digital reading, ISBN codes are constantly evolving. In addition to the original 13 bit, there is also the integration of 10 bit ISBN- 10. At present, more than 160 countries in the world use ISBN code, and more than150,000 books are published under this logo, and this number is still growing.