How many teams in the NBA have retired number 23?

Would Celtics re-issue retired numbers? Don't count on it – Boston Herald

Will Lakers retire both of LeBron James' jersey numbers when he hangs it up? - Los Angeles Times

The next likely jersey retirement for every NBA team

Retired number - Wikipedia

All-time list of retired numbers in the NBA

LeBron James will join this list of NBA players with numbers retired by multiple teams – NBC Los Angeles

Why is the number 23 so popular in the NBA? - Quora

NBA: Raised and Retired Numbers by Team

Bill Russell's No. 6 jersey to be retired throughout NBA

Team-by-team look at every retired jersey in NBA history

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