Why do NBA jerseys have 6 on them?

Steph Curry, LeBron James Top NBA Jersey Sales; Lakers No. 1 in Team Merchandise, News, Scores, Highlights, Stats, and Rumors

LeBron James Leads NBA Jersey Sales, Stephen Curry Comes In Second

Knicks rookie Kristaps Porzingis is toast of NYC as his jersey is flying off shelves – New York Daily News

L.A. Lakers' LeBron James changing his jersey number - again - back to No. 23

Cavaliers Won't Be Able to Wear Their Black-Sleeve Jerseys in Game 6

Anthony Davis Los Angeles Lakers City Edition Nike Dri-FIT NBA Swingman Jersey.

Why Do NBA Players Have a No. 6 Patch on Their Jerseys?

NBA to Retire Late Celtics Legend Bill Russell's No. 6 Jersey

Lakers' LeBron James explains why he switched jersey to No. 6

Why are NBA teams wearing '6' on jerseys this season: All you need to know

Why are NBA players wearing No. 6 on their jerseys? – NBC Sports Philadelphia