Run batted in

A run batted in (RBI) is a statistic in baseball and softball that credits a batter for making a play that allows a run to be scored. For example, if the batter bats a base hit which allows a teammate already on base to reach home, thus scoring a run, then the batter gets credited with an RBI. Certain situations are excluded, such as when an error is made on the play. Before the 1920 Major League Baseball season, runs batted in were not an official baseball statistic. Nevertheless, the RBI statistic was tabulated—unofficially—from 1907 through 1919 by baseball writer Ernie Lanigan, according to the Society for American Baseball Research. Common nicknames for an RBI include "ribby" (or "ribbie"), "rib", and "ribeye". The plural of "RBI" is a matter of "(very) minor controversy" for baseball fans: it is usually "RBIs", in accordance with the usual practice for pluralizing initialisms in English; however, some sources use "RBI" as the plural, on the basis that it can stand for "runs batted in".