73400320

The identifier "73400320" is commonly associated with the **International Standard Book Number (ISBN)** system, specifically as a **group identifier** for publishers in certain regions. ISBNs are unique numeric commercial book identifiers assigned to books and book-like publications. The number "73400320" is part of the ISBN-10 format, which was widely used before the transition to ISBN-13.

In the ISBN-10 system, the first segment (group identifier) typically identifies the country or language region where the publisher is based. The number "734" corresponds to publishers in **China**, as assigned by the International ISBN Agency. The subsequent digits, "00320," further narrow down the publisher within that region.

ISBNs are used globally to catalog and track books, ensuring accurate identification in libraries, bookstores, and online retailers. The transition to ISBN-13, a 13-digit barcode format, began in 2007, but ISBN-10 remains valid for existing titles. Publishers in China continue to use ISBNs to register their publications, and "73400320" serves as a prefix for books published by specific Chinese entities.

While the exact publisher associated with "73400320" may vary, it is not a widely recognized or publicly documented identifier in general knowledge. For precise details about a specific book, consulting the ISBN database or the publisher’s records is recommended. The system ensures standardization in the publishing industry, facilitating global distribution and inventory management.