The term STAT in baseball refers to three different statistics: ERA (Earned Run Average), SAVE (number of games a relief pitcher has saved) and ASSIST (number of times a fielder has helped put out a batter). ERA is a measure of how many runs a pitcher has allowed per nine innings. SAVE is a statistic that measures the effectiveness of a relief pitcher in preserving a lead. ASSIST is a statistic that measures the number of times a fielder has helped put out a batter.