V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

URI
       Universal Resource Identifier (WWW, RFC 1630/2396)


The Free On-line Dictionary of Computing (30 December 2018):

Universal Resource Identifier
URI

    (URI, originally "UDI" in some WWW
   documents) The generic set of all names and addresses which
   are short strings which refer to objects (typically on the
   Internet).  The most common kinds of URI are URLs and
   relative URLs.

   URIs are defined in RFC 1630.

   W3 specification
   (http://w3.org/hypertext/WWW/Addressing/URL/URI_Overview.html).

   (1997-07-16)


Hitchcock's Bible Names Dictionary (late 1800's):

Uri, my light, my fire