What is the 42 on the warriors jersey?

The number 42 on the Golden State Warriors' jersey is retired in honor of Nate Thurmond, who played for the Warriors from 1963-1974. Thurmond was a seven-time NBA All-Star and is considered one of the best centers in NBA history. He retired with the Warriors as their all-time leading rebounder and was the first player in NBA history to record a quadruple-double. Thurmond passed away in 2016 and was inducted into the Naismith Memorial Basketball Hall of Fame posthumously in 2018.