This is the ValueSet that contains all the codes in Product Name Type (http://hl7.org/fhir/ValueSet/medicinal-product-name-type) and Product Name Types Terminology (http://hl7.org/fhir/us/pq-cmc-fda/ValueSet/cmc-product-name-types-vs). E.g. what you have to deal with if you get resources containing codes in either of them