The dark '91' sticker on the back of the Patriot helmets is a tribute to deceased teammate Marquise Hill.
1961
Several NFL teams are honoring the late Sean Taylor, #21 on the Washington Redskins, after he was killed in a botched burglary at his home in Miami.
No bike helmets don't reduce the number of bike accidents, but they do reduce the serious injuries related to the accidents. Bike helmets save lives.
That honors Redskins safety Sean Taylor who was murdered in a botched robbery attempt in November, 2007.
Because Washington Redskins Safety Sean Taylor was shot and killed and his number was 21. So, every team in the NFL wears that on the back of their helmets.
It represents what number that player is
the player's number
The San Francisco 49ers, not the New York Giants, had the '34' and '35' decals on their helmets. Those decals were in honor of former 49ers running backs (and Hall of Famers) Joe Perry (34) and John Henry Johnson (35) who both passed away in the offseason prior to the 2011 season.
The Buckeyes wore a No. 32 on their helmets in memory of former OSU great Jack Tatum, who died on July 27.
Will Beatty is number 65 on the New York Giants.
Will Hill is number 25 on the New York Giants.
No player has ever worn that number for the Giants during the regular season.