Pittsburgh Pirates Uniform Numbers. Team Names: Pittsburgh Pirates, Pittsburgh Alleghenys. Seasons: ( to ) .. 15 Players. View all # 21's. View the latest Pittsburgh Pirates news, scores, schedule, stats, roster, standings, players, fantasy leaders, rumors, videos, photos, injuries. The Pittsburgh Pirates have retired nine numbers, seven for players and Stargell played his entire 21 -year career with the Pirates, coming up.