“ #9s look good on NFL uniforms too. Drew Brees is the iconic #9, but Steve McNair, Tony Romo, and Matt Stafford are great #9s too. A nine tells that incoming pass rusher “My eyes are up here, big guy” and now that blitzer is holding his jock strap while a #9 quarterback wriggles away for another big completion down the field.”
https://medium.com/sportsraid/ranking-the-best-and-worst-nfl-quarterback-jersey-numbers-football-humor-cool-factor-carson-wentz-11-qb-52586ad13539