An identifier is a string of characters (up to 255 characters in length) used to identify “named” objects in Pinecone. The following Pinecone objects use strings as identifiers:

ObjectFieldMax # charactersAllowed characters
Organizationname512UTF-8 except \0
Projectname512UTF-8 except \0
Indexname45A-Z, a-z, 0-9, and -
Namespacenamespace512ASCII except \0
Recordid512ASCII except \0