In the NFL, players wear uniform numbers based on the position they play.

The current system was instituted into the league on April 5, 1973, as a means for fans and officials (referees, linesmen) to more easily identify players on the field by their position. Players who were already in the league at that date were grandfathered, and did not have to change their uniform numbers if they did not conform.

Since that date, players are invariably assigned numbers within the following ranges, based on their primary position:

Quarterbacks, placekickers and punters: 0–0
Wide Receivers: 0-0, or 0-0 if all are taken
Running backs and defensive backs: 0–0
Offensive linemen: 0–0
Linebackers: 0–0 and 0–0, or 0-0 if all are taken
Defensive linemen: 0–0 and 0–0
Tight ends: 0–0, or 0–0 if all are taken

I know what ya all are thinking, ya'll is thinking, "Big Man, ya is nuts if ya think we know all that", but if ya can give me the answer to half of them , I'll give ya a full score, if ya get them all, I'll give ya 2 scores....

All ya gotta do is fill in the 0's

Big Man Out