ISNI stands for “International Standard Name Identifier.”
It is a 16-digit unique code that unambiguously identifies individual writers, artists, performers and other creators. The ISNI can be linked to other identifier codes to identify writers/artists across multiple platforms.
ISNIs help with distinguishing between names that may otherwise be confused, such as John Smith, in order to clarify royalty and licensing payments. A person may also have more than one ISNI – for example, an artist who performs under a pseudonym may have an ISNI for their given name as well as the pseudonym.
To get an ISNI, you will need to contact one of the ISNI Registration Agencies listed via https://isni.org/