What does the acronym ISBN stand for in the context of books?

The acronym ISBN stands for International Standard Book Number. This unique identifier is assigned to books and is used internationally to facilitate the identification and ordering of published works. Each ISBN is a specific number that helps differentiate one book from another, making it easier for publishers, libraries, and retailers to manage inventory and for consumers to find the exact title they are looking for. The standardization of this numbering system helps in cataloging and ensuring that books can be accurately tracked and sourced across different markets and platforms.

The other choices do not reflect recognized terminology related to book identification, and they lack the established framework that the ISBN provides for the global book industry.