Rugby football, History of rugby union, Rugby union, Rugby Football Union, Rugby league, Rugby School, Blackheath F.C., International Rugby Board, History of rugby league, Rugby union at the Summer Olympics, History of the Rugby World Cup, Experimental law variations, Timeline of foundation of national rugby unions, South African Rugby Union, Rugby World Cup, Records and statistics of the Rugby World Cup, Comparison of rugby league and rugby union, Football (word), Tackle (football move), Rugby league positions, Rugby union positions, List of players who have converted from one football code to another, Rugby sevens, Tag Rugby