The ISSN 979 code, similar to 978, is used in the context of the ISBN (International Standard Book Number), but it does not refer to the ISSN.
The 979 prefix was introduced to expand the capacity of the ISBN system in response to the increasing number of publications.
While the 978 prefix is used for books and non-periodical publications, the 979 prefix was initially reserved for printed music (such as scores), but it has since been extended to include books as well. This expansion ensures that there are enough ISBN numbers available to meet the growing global demand for publications.
