A sac fly earns one run, which is an important statistic in baseball. A sac fly is when a batter hits a fly ball that allows a runner on base to advance and score. The acronym TAGUP stands for 'Touch and Go, You're Out, ' which is the call made by the umpire when a runner tags up and advances to the next base. CYST stands for 'Caught You, Safely There, ' which is the call made by the umpire when a runner is caught stealing and is safe at the base. RBI stands for 'Runs Batted In, ' which is the statistic used to measure the number of runs a batter has earned for their team.