Uniform number (American football)
In American football, uniform numbers are special numbers added to jerseys or other types of clothing to tell players from each other. They are shown in more places on the uniform than in those of other sports.
Uniform Number (American Football) Media
Cornerback Dré Bly seen in 2007 with numbers visible on the front and shoulders of his uniform
Alabama Crimson Tide football players (in red) facing off against the Florida Gators with uniform numbers visible on their helmets