The Houston Astros are wearing the number 21 on their jerseys to honor Roberto Clemente Day. This special day commemorates Roberto Clemente, a Baseball Hall of Famer and legendary Puerto Rican player who wore No. 21 throughout his career. Clemente tragically died in a plane crash while delivering supplies to earthquake victims in Nicaragua on New Year's Eve 1972. The Astros, including several Puerto Rican players and others, wear No. 21 to celebrate his life, achievements, and legacy as a player and humanitarian. This tribute is part of a Major League Baseball-wide recognition on September 15 each year, which coincides with Hispanic Heritage Month and celebrates Clemente's impact on the game and community.