Question: What is a social security number in the country where a museum is prominently located in Trafalgar Square?

<P0-S0> London is home to many museums, galleries, and other institutions, many of which are free of admission charges and are major tourist attractions as well as playing a research role. <P0-S1> The first of these to be established was the British Museum in Bloomsbury, in 1753. <P0-S2> Originally containing antiquities, natural history specimens and the national library, the museum now has 7 million artefacts from around the globe. <P0-S3> In 1824 the National Gallery was founded to house the British national collection of Western paintings; this now occupies a prominent position in Trafalgar Square. <SEP> <P1-S0> Visitors could use the system to determine which pictures they would like to see in the gallery. <P1-S1> It was possible to print out personalised information for use during the visit. <P1-S2> A micro gallery was a computer-based guide to archives and museum collections, first developed for the collections at the National Gallery in London, UK It took three years to develop by the company Cognitive Applications, and opened in July 1991 as part of the facilities in the Sainsbury Wing. <P1-S3> The Micro Gallery ran for 14 years and a CD-ROM with similar facilities was produced. <SEP> <P2-S0> in the united states, a social security number (ssn) is a nine - digit number issued to u.s. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the social security act, codified as 42 u.s.c. <P2-S1> § 405 (c) (2). <P2-S2> the number is issued to an individual by the social security administration, an independent agency of the united states government. <P2-S3> although its primary purpose is to track individuals for social security purposes, the social security number has become a de facto national identification number for taxation and other purposes. <SEP> <P3-S0> north carolina museum of art, occupying a large suburban campus on blue ridge road near the north carolina state fairgrounds, maintains one of the premier public art collections located between washington, d.c., and atlanta. <P3-S1> in addition to its extensive collections of american art, european art and ancient art, the museum recently has hosted major exhibitions featuring auguste rodin (in 2000) and claude monet (in 2006-07), each attracting more than 200,000 visitors. <P3-S2> unlike most prominent public museums, the north carolina museum of art acquired a large number of the works in its permanent collection through purchases with public funds. <P3-S3> the museum's outdoor park is one of the largest such art parks in the country. <P3-S4> the museum facility underwent a major expansion which greatly expanded the exhibit space that was completed in 2010. the 127,000 sf new expansion is designed by nyc architect thomas phifer and partners. <SEP> <P4-S0> It is also used for some purposes in the UK tax system. <P4-S1> The number is described by the United Kingdom government as a ``personal account number ''. <P4-S2> The National Insurance number is a number used in the United Kingdom in the administration of the National Insurance or social security system.