I guess that's showing my age, URI used to stand for Universal Resource Identifier which URL derives from.

https://en.wikipedia.org/wiki/Uniform_Resource_Identifier#Re...

>The publication of IETF RFC 2396 in August 1998 saw the URI syntax become a separate specification and most of the parts of RFCs 1630 and 1738 relating to URIs and URLs in general were revised and expanded by the IETF. The new RFC changed the meaning of U in URI from "Universal" to "Uniform."