The ISSN 978 code is used to identify books and other non-periodical publications.
Actually, the "978" prefix is associated with the ISBN (International Standard Book Number), not the ISSN.
The ISBN is a unique identifier for books, assigned to each edition and variation (except for reprints) of a book. The ISBN system aids in the identification and cataloging of books by publishers, libraries, book retailers, and distributors. The transition to the 13-digit ISBN format has allowed integration with the EAN system, making it easier to sell and distribute books globally.
