Number (sports) - Wikipedia
NFL rule proposal would allow more players to wear single-digit numbers like in college football
2021 NFL rule changes: Expanded jersey numbers among 6 new rules
NFL likely to pass rule allowing more single-digit jersey numbers
Which NFL players are changing jersey numbers? Track every switch around the league
Proposal Would Allow College Football Players To Wear No. 0 – SportsLogos.Net News
NFL likely to pass rule allowing more single-digit jersey numbers
NFL rule changes: Expanding uniform numbers available to players could lead to increased sales - The Athletic
Several players change their jersey numbers after new rule passes – Quirky Research
NFL approves 7 new rules for 2021 season including single digit jersey expansion