URN

Full Title or Meme

Uniform Resource Name URN is the term for a specific type of URI intended to persistently identify a resource, i.e., an identifier that will never change no matter how often the resource moves, changes labels, changes owners, etc. URNs are intended to last forever.

Context

In order to ensure the global uniqueness of URN namespaces, their identifiers (NIDs) are required to be registered with the IANA. Registered namespaces may be "formal" or "informal".

References

https://en.wikipedia.org/wiki/Uniform_Resource_Name