The number of players that are permitted to be on the field in an active association football and American football match is 22. National Football League Hall of Famer Emmitt Smith wore the number 22 during his Dallas Cowboys career. "Twenty-two" is a common name for the .22-caliber .22 Long Rifle cartridge. American singer-songwriter and actress Taylor Swift has a song titled "22."
Although the Dallas Cowboys have a policy of not retiring numbers, the number 22 has not been given to a player since Emmitt Smith left the team in 2002. Emmitt Smith was a running back in the NFL for 15 seasons during the 1990s and 2000s. He played professionally for the Dallas Cowboys and Arizona Cardinals and is held in high esteem as one of the greatest running backs in NFL history. As of 2014, he is the only running back to ever win a Super Bowl championship, the NFL Most Valuable Player award, the NFL rushing title, and the Super Bowl MVP award all in the same season.
The song "22" was recorded by Taylor Swift for her fourth studio album, "Red." The lyrics describe what it feels like to be 22 years old. It became the sixth single from Red to enter the top 20 on the "Billboard Hot 100" chart.