Batting Statistical Categories:
 
R: A run is scored when a player advances around first, second and third base and returns safely to home plate, touching the bases in that order, before three outs are recorded.
 
2B: A double is the act of a batter striking the pitched ball and safely reaching second base without being called out by the umpire, without the benefit of a fielder's misplay or another runner being put out on a fielder's choice.
 
3B: A triple is the act of a batter safely reaching third base after hitting the ball, with neither the benefit of a fielder's misplay nor another runner being put out on a fielder's choice.
 
HR: A home run is scored when the ball is hit in such a way that the batter is able to circle all the bases, ending at home plate and scoring runs for himself and each runner who was already on base, with no errors by the defensive team on the play.
 
RBI: The official scorer shall credit the batter with a run batted in for every run that scores: (1) unaided by an error and as part of a play begun by the batter's safe hit (including the batter's home run), sacrifice bunt, sacrifice fly, infield out or fielder's choice, unless Rule 10.04(b) applies; (2) by reason of the batter becoming a runner with the bases full (because of a base on balls, an award of first base for being touched by a pitched ball or for interference or obstruction); or (3) when, before two are out, an error is made on a play on which a runner from third base ordinarily would score. (b) The official scorer shall not credit a run batted in (1) when the batter grounds into a force double play or a reverse-force double play; or (2) when a fielder is charged with an error because the fielder muffs a throw at first base that would have completed a force double play. (c) The official scorer's judgment must determine whether a run batted in shall be credited for a run that scores when a fielder holds the ball or throws to a wrong base. Ordinarily, if the runner keeps going, the official scorer should credit a run batted in; if the runner stops and takes off again when the runner notices the misplay, the official scorer should credit the run as scored on a fielder's choice.
 
SB: A stolen base occurs when a baserunner successfully advances to the next base while the pitcher is delivering the ball to home plate. If, however, the defense makes no attempt to put the baserunner out (for example, if the catcher doesn't even look his way), the play is scored as "defensive indifference", and no stolen base is credited to the runner.
 
BB: A base on balls (walk) is credited to a batter when the batter receives four pitches that the umpire calls balls.
 
AVE: Batting average is a batter's ratio of hits to at bats. Note that a base on balls does not count towards a batters at bat total. 

 
Pitching Statistical Categories:
 
IP: Innings pitched are the number of innings a pitcher has completed, measured by the number of batters and baserunners that are put out while the pitcher on the pitching mound in a game. One out counts as one-third of an inning (denoted as .1 innings), and two outs counts as two-thirds of an inning (denoted as .2 innings).
 
W: A win is given to a pitcher if (a) the pitcher starts the game and pitches for 5 or more innings, (b) the pitcher leaves the game with the lead, (c) and the lead is not relinquished at any point in the game. If the lead is retaken by the team, the win would be available only for the current relief pitcher in the game. The winning pitcher can not be credited with a save or a hold.
 
CG: A complete game is awarded to a player that pitches the entire game himself. The game must be an official game to count, meaning a picher can obtain a complete game after 5 innings of play or 4.5 innings if the home team is leading. If a game goes into extra innings the pitcher still must remain in the game to recieve the complete game (pitching 10 or more innings), and a pitcher can still lose the game and recieve a complete game.
 
SV: A pitcher is given a save if (a) he is the finishing pitcher in a game won by his team, (b) he is not the winning pitcher, (c) he is credited with at least !S of an inning pitched and (4) he satisfies one of the following conditions: 1. He enters the game with a lead of no more than three runs and pitches for at least one inning 2. He enters the game, regardless of the count, with the potential tying run either on base, at bat or on deck 3. He pitches for at least three innings.
 
BB: A base on balls (walk) is credited to a pitcher when the batter receives four pitches that the umpire calls balls.
 
K: A strikeout occurs when a batter receives three strikes during his at bat.
 
HLD: A hold is awarded to a relief pitcher who (a) enters the game in a save situation, (b) He is not the winning pitcher; and (c) qualifies under one of the following conditions: (i) He enters the game with a lead of no more than three runs and pitches for at least one inning; or (ii) He enters the game, regardless of the count, with the potential tying run either on base, or at bat, or on deck; or (iii) He pitches effectively for at least three innings.), AND; 2) Records at least one out, AND; 3) Leaves the game before it has ended without his team having relinquished the lead at any point and does not record a save.
 
ERA: Earned run average is the mean of earned runs given up by a pitcher per nine innings pitched. Runs resulting from batters who reach base on an error (even a pitcher error) and later score are called unearned runs, and do not count toward ERA.
 
WHIP: Walks and hits per inning pitched is the average number of walks and hits allowed by the pitcher per inning.