1 The W3C offers an explanation that compares the URN to the URI and the URL. 2  Here is a page of links to sites related to Uniform Resource Names. 3  Ron Daniels' page on Uniform Resource Identifiers offers several clarifying thoughts.ontinue Reading About URN (Uniform Resource Name). 1  The W3C offers an explanation that compares the URN to the URI and the URL. 2  Here is a page of links to sites related to Uniform Resource Names.
Wiktionary(0.00 / 0 votes)Rate this definition: 1  jigsaw(Noun) A saw with fine teeth and a narrow blade which can cut curves in wood or metal. 2  jigsaw(Noun) A jigsaw puzzle. 3  jigsaw(Verb) To cut something using a jigsaw.
The Origin of Jigsaw Puzzles. The first jigsaw puzzle was believed to be constructed around 1760 by British mapmaker John Spilbury. Spilbury took one of his world maps, pasted it to a sheet of hardwood and cut around the borders of the countries with a fine-bladed saw. The result was a useful visual aid to help children learn world geography.