olemus
numberkood perioodikaväljaannete identifitseerimiseks,
8-kohaline, ISBN analoog; kasutusel alates aastast 1975
= 8-digit code used to identify newspapers, journals, magazines and periodicals of all kinds and on all media–print and electronic

struktuur
https://s3.amazonaws.com/libapps/accounts/46396/images/800px-issn-barcode-explained.png

näiteid
https://duckduckgo.com/?q=issn+code&t=h_&iax=images&ia=images

ülevaateid
https://en.wikipedia.org/wiki/International_Standard_Serial_Number

https://portal.issn.org/

http://www.issn.org/

https://species.wikimedia.org/wiki/ISSN

standardid
https://www.iso.org/obp/ui/#iso:std:iso:3297:ed-5:v1:en