ISSnTunnuksia

ISSnTunnuksia refers to the International Standard Serial Number, commonly known by its acronym ISSN. It is a unique eight-digit alphanumeric identifier that specifically identifies periodical publications, such as magazines, journals, and newspapers. The ISSN is managed by the ISSN International Centre and its network of National Centres. It is distinct from the ISBN (International Standard Book Number), which is used for books.

The primary purpose of an ISSN is to facilitate the identification and retrieval of serial publications. It is used in various contexts, including library cataloging, interlibrary loan systems, and the management of subscription services. An ISSN is assigned to a publication regardless of its language, format (print or electronic), or geographical origin. The identifier is composed of two blocks of four digits, separated by a hyphen, with a check digit at the end. This check digit is calculated using a specific algorithm to ensure the validity of the ISSN.

The ISSN system was established by the International Organization for Standardization (ISO) in 1971 and officially adopted as an international standard in 1975. National centres are responsible for assigning ISSNs to serials published within their respective countries. While the ISSN itself does not convey any information about the content of the publication, its presence is crucial for the efficient management and bibliographic control of serials worldwide.