Before becoming a running back with the Packers, Hornung was a star quarterback at Notre Dame, and Green Bay gave the "Golden Boy" the same Number 5 he made famous with the Irish. The NFL didn't implement rules requiring numbers for specific positions until the 1970s.
2 of 9AP
This eight-time NFL receiving champion wore Number 14 as he terrorized defenses from 1935 to 1945.
3 of 9Neil Leifer/SI
The dynamic receiver lit up the AFL and NFL wearing what was then an uncharacteristic Number 19 jersey.
4 of 9AP
A powerful rusher and a bone-crushing linebacker, Nagurski dominated in the 1930s while sporting Number 3.
5 of 9Courtesy of Philadelphia Eagles
Steve Van Buren
In his Number 15 jersey, Van Buren won four rushing titles and helped the Eagles rule the NFL in the late 1940s.
6 of 9Hy Peskin/SI
Gifford, Number 16, was a brilliant running back, flanker and defensive back for the Giants, and his excellence on the field was matched by his notoriety off it.
7 of 9Hy Peskin/SI
A quarterback who wore Number 22, Layne helped the Lions win three titles before he retired in 1962 holding most of the all-time passing records.
8 of 9AP
"Slingin' Sammy" was the premier quarterback of his era (1937-1952) but wore what we now consider a running back number: 33.
9 of 9Peter Read Miller/SI
When Keyshawn arrived in Jets camp in 1996, all the 80s were taken by veterans, so he was allowed to wear 19. He could have switched later to a more traditional number but chose to stand out with his lower number.
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