Yorkshire County Cricket Club is one of eighteen first-class county clubs within the domestic cricket structure of England and Wales. It represents the historic county of Yorkshire. The club's limited overs team is called the Yorkshire Vikings. Yorkshire teams formed by earlier organisations, essentially the old Sheffield Cricket Club, had major status and so the county club is rated accordingly from inception: i.e., classified as an unofficial first-class team by substantial sources from 1863 to 1894; classified as an official first-class team from 1895 by Marylebone Cricket Club (MCC) and the County Championship clubs; classified as a List A team since the beginning of limited overs cricket in 1963; and classified as a major Twenty20 team since 2003.