URL - '''U'''niform '''R'''esorce '''L'''ocator
(http://www.ietf.org/rfc/rfc2718.txt RFC rfc2718)

A subset of [URI] that may be (http://www.w3.org/TR/uri-clarification/#contemporary considered deprecated).
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!!! Deprecated?
The curious could start at (http://www.w3.org/Addressing/ Naming and Addressing) and then review the more recent (http://www.gbiv.com/protocols/uri/rev-2002/rfc2396bis.html#URLvsURN rfc2396) draft  with its (http://www.gbiv.com/protocols/uri/rev-2002/issues.html#019-URI-URL-URN associated discussion). The clincher though is probably the stated RFC merge in the (http://www.gbiv.com/protocols/uri/rev-2002/rfc2396bis.html#intro introduction.)

So, it would appear that URLs (and URNs) have lost their importance, and that the parent [URI] is the preferred term.
Damn, and '''Earl''' rolled off the tongue so nicely - '''Oori'''?