In baseball RBI means runs batted in and ERA means earned run average.
A run batted in (RBI; plural RBIs or RBI), is a statistic in baseball and softball that credits a batter for making a play that allows a run to be scored (except in certain situations such as when an error is made on the play). In baseball statistics, earned run average (ERA) is the average of earned runs given up by a pitcher per nine innings pitched (i.e. the traditional length of a game). 
