This is to enforce the string passed as Unicode NCHAR, NVARCHAR or NTEXT datatype, as opposed to CHAR, VARCHAR or TEXT. SQL Server only supports UTF-16 Unicode.
http://databases.aspfaq.com/general/why-do-some-sql-strings-have-an-n-prefix.html
http://databases.aspfaq.com/database/what-datatype-should-i-use-for-my-character-based-database-columns.html
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