Fair catch catch is called a "mark"; see mark (rugby) and mark (Australian football) for more information (however in Australian Rules Football the player is not protected from the opposition team while attempting a mark). Fair catches featured in some extinct forms of football, and they have been abolished in other modern codes. In Rugby league the defensive player attempting to catch the ball cannot be tackled whilst in the air, though the attacking players can contest the ball by attempting to catch it themselves. A player who successfully catches the ball is able to be tackled only once they have landed
Comparison of American football and rugby union the only competition between national teams is the IFAF World Championship, which is not considered a major event when compared to the Olympic Games, FIFA World Cup and the Rugby World Cup. The dimensions of an American football field are measured in United States customary units (essentially the same as British Imperial units). Rugby union originally marked and quoted its measurements in Imperial but converted to Metric units in 1977. When these conversions were made the measurements were generally adjusted to the closest round-number measurement in the metric system. Although both codes are played on similar sized rectangular fields, the