I don't know, idiot!
New York Giants
he has been retired for a few years
The Houston Oilers were the first to retire from the NFL. -- Sterlo Crowe
The Seattle Seahawks
In honour of the loudest fans in the NFL, the Seattle Seahawks retired the number 12 to honour their fan base which calls themselves the 12th man. It was retired on December 15, 1984.
It means you will be forever remember with the team who retired your number. No one else on that team can have your number. Actually, if the organization sees fit anyone can wear the number even while it's retired. It'll still be retired and people will remember who wore it, but the number will be considered active.
The name Oilers was retired per the request of team owner Bud Adams.
The first Giants jersey to be retired, which was also the first jersey ever retired by an NFL team, was the #1 of offensive/defensive end Ray Flaherty in 1935.