Is there a rule in the NFL that prevents a player from having a three digit jersey number? - Quora
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Dominant Digits -- The 10 most popular jersey numbers among current NFL players - ESPN
Charvarius Ward, Talanoa Hufanga, Brock Purdy among several 49ers changing jersey numbers
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The Steelers 'Digit Dynasty': Who wore the number best? No. 0-25 - Behind the Steel Curtain
Best NBA Players by Jersey Number - Sports Illustrated
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