This is actually the range assigned to your posting via the publisher, and it's the 1 you'll use to reference your post in the library catalogues. ISSN code (also called as "ISSN construction" or "ISSN syntax") might be expressed as follows: NNNN-NNNC Both of these support models deliver tutorial institutions https://www.directivepublications.org/journal-of-applied-nanoscience/