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1B -- 1) See "Base Hit". 2)See "First Baseman".
2B -- 1) See "Double"; abbreviation for a double. 2) See "Second Baseman".
3B -- 1) See "Triple"; abbreviation for a triple. 2) See "Third Baseman".

AB -- See "At Bat"; abbreviation for an at bat.
A -- See "Assist(s)"; abbreviation for assist. Also used in scorekeeping.
Ace -- A team's best starting pitcher.
Alley -- The section of the outfield between the outfielders. Also "gap."
AO - See "Fly Out"; abbreviation for a fly out.
At Bat -- A batter is charged with an at-bat when he makes an out (unless credited with a sacrifice bunt or sacrifice fly), or reaches base on a base hit, on a fielding error or on a fielder's choice. A batter is not charged with an at-bat if he is credited with a walk or hit by pitch, or reaches base on catcher's interference.
Around The Horn -- A double play going from third base to second to first.
Assist(s) -- A fielder is credited with an assist any time he throws or deflects a batted or thrown ball in such a way that a putout results, or would have resulted except for a subsequent error by any fielder.
AVG -- See "Batting Average"; abbreviation for a batting average.

Backdoor Slider -- A pitch that appears to be out of the strike zone, but then breaks back over the plate.
Bag -- A base.
Balk -- A pitcher is charged with a balk when, with a runner on base, the pitcher, while touching the pitching rubber, makes any motion naturally associated with his pitch and fails to make such delivery.
Baltimore Chop -- A ground ball that hits in front of home plate (or off of it) and takes a large hop over the infielder's head.
Bandbox -- A small ballpark that favors hitters.
Bang-Bang Play -- A play in which the baserunner hits the bag a split-second before the ball arrives or vice versa.
Basket Catch -- When a fielder catches a ball with his glove near belt level.
Batting Average -- Divide the number of base hits by the total number of at bats.
Bases On Balls -- A batter is credited with a base on balls (walk) when the pitcher throws four pitches outside of the strike zone during one plate appearance.
BB -- see "Bases On Balls"; abbrevation for bases on balls or walk.
Bermuda Triangle -- This the area on the field when three players, usually two outfielders and an infielder chase after a pop up. The three fielders active in the play are representing the three points on a triangle. The name Bermuda Triangle is from a nautical term defining a section in the Atlantic Ocean in which strange weather patterns have caused ships to mysterious disappear. As is in baseball, when a ball enters the triangle, it can represent a challenge for fielders. Either the fielders can run into each other; the ball falls on the field safely; or one of the fielders catches the ball.
Bronx Cheer -- When the crowd boos.
Brushback -- A pitch that nearly hits a batter.
Bush -- Also "bush league." An amateur play or behavior.

C -- See "Catcher". Abbreviation for catcher.
Can Of Corn -- An easy catch by a fielder.
Catcher - Desiganted person assisgned to catch the pitched balls behind hole plate. Assigned #2 infielding plays.
Caught Looking -- When a batter is called out on strikes.
Caught Stealing -- A runner is charged with a caught stealing if he is put out attempting to advance to the next base without the ball having been hit into play.
Cellar -- Last place. Also "basement."
Center Field -- A player designated to play the center part of the outfield. Assigned #8 infielding plays.
CF -- See "Center Field".
Cheese -- Also "good cheese." Refers to a good fastball.
Chin Music -- A pitch that is high and inside.
Circus Catch -- An outstanding catch by a fielder.
CL -- See "Closer".
Closer -- A team's relief pitcher who finishes the game.
CS -- see "Caught Stealing"; abbreviation for caught stealing.
Cutter -- A cut fastball (one with a late break to it).
Cycle -- When a batter hits a single, double, triple and home run in the same game.

DER -- See "Defensive Efficiancy Rating"; abbreviation for defensive effiency rating.
Defensive Effiency Rating -- Ratio of team defensive outs recorded in defensive opportunities. To determine Defensive Efficiency Rating for a team, divide the total number of hits in play allowed (not including home runs) by the total number of defensive opportunities (all balls hit into play, not including home runs) and subtract from one: 1-((H-HR)/(PA-HR-BB-HBP-SO)).
Dinger -- A home run.
Dish -- Home plate.
Double -- A batter is credited with a double when he hits the ball into play and safely reaches second base without an intervening error or attempt to put out another baserunner.
Double Play -- A fielder is credited with participation in a double play if he earns a putout or an assist in a play when two or three outs are recorded on a play before the play becomes dead, unless an error or misplay intervenes between putouts.
DP -- See "Double Play"; abbreviation for double play.

E -- See "Error(s)"; abbreviation for errors. Also used in scorekeeping.
Earned Runs -- The total number of earned runs allowed by the pitcher. An earned run is a run for which the pitcher is held accountable, and shall be charged every time a runner reaches home base by the aid of a hit, sacrifice bunt, sacrifice fly, stolen base, putout, fielder's choice, base on balls, hit batter, balk or wild pitch (including a wild pitch on third strike which permits a batter to reach first base) before fielding chances have been offered to put out the offensive team. In determining earned runs, the inning should be reconstructed without the errors (including catcher's interference) and passed balls, and the benefit of the doubt should always be given to the pitcher in determining which bases would have been reached by errorless play.
Earned Run Average -- The total number of earned runs allowed by the pitcher, divided by his total innings pitched, multiplied by nine.
ER -- See "Earned Run(s)"; abbreviation for earned runs.
ERA -- See "Earned Run Average". Also used in scorekeeping.
Error(s) -- A fielder is charged with an error whose wild throw permits a runner to reach a base safely, or advance to the next base, when in the scorer's judgment a good throw would have put out the runner or prevented him from advancing to the next base, or whose failure to stop, or try to stop, a batted or accurately thrown ball permits a runner to advance.
Extra Base Hit(s) -- Add the total number of doubles, triples and home runs.

Fielding Percentage -- Divide the total number of putouts and assists recorded by the fielder, by the total number of putouts, assists and errors credited to the fielder.
Fireman -- A team's closer or late-inning relief pitcher.
First Baseman -- The fielder desiganted to play at first base. Assigned #3 infielding plays.
Fly Out -- The total of all fly balls hit by the batter into outs, not including line drives.
FPCT -- See "Fielding Percentage"; abbreviation for fielding percentage.
Fungo -- A ball hit to a fielder during practice. It's usually hit by a coach using a "fungo bat," which is longer and thinner than a normal bat.

G -- see "Games Played"; abbreviation for games played.
Games Finished -- A pitcher is credited with a game finished if he is the last relief pitcher for his team in a game and was not the starting pitcher.
Games Played -- The total number of games in which the player appeared, whether as a starter or as a substitute.
Gap -- See "Alley." A ball hit here is a "gapper."
GF -- See "Games Finished".
GIDP -- See "Ground Into Double Play"; abbreviation for grounded into double play.
GITP -- See "Ground Into Triple Play"; abbreviation for grounded into triple play.
GO -- See "Ground Out(s)"; abbreviation for ground out(s).
Gopher ball -- A pitch hit for a home run, as in "go for."
Grand slam -- A home run with the bases loaded.
Ground Into Double Play -- A batter is charged with grounding into a double play when he hits the ball into play on the ground, with none out or one out, and two outs occur before the play becomes dead, without an intervening error or misplay between putouts.
Ground Into Triple Play -- A batter is charged with grounding into a triple play when he hits the ball into play on the ground, with none out, and three outs occur before the play becomes dead, without an intervening error or misplay between putouts.
Ground Out(s) -- The total of all ground balls hit by the batter into outs, not including bunts.
GS[H] -- See "Grand Slam"; abbreviation for grand slam [home run].

H -- See "Hit"; abbreviaiton for a hit.
HB -- See "Hit Batsmen".
HBP -- See "Hit By Pitch"; abbreviaiton for hit by pitch.
Heat -- A good fastball. Also "heater."
High And Tight -- Referring to a pitch that's up in the strike zone and inside on a hitter. Also known as "up and in."
Hill -- Pitcher's mound.
Hit -- A batter is credited with a hit when he reaches first base (or any other base) safely on a ball hit into play in fair territory, after it touches the ground or a fence before being touched by a fielder, or which clears a fence, and when the fielder could not retire the batter with ordinary effort.
Hit By Pitch -- The number of times the batter reached base as a result of being hit by a pitch; when a pitcher hits a batter with a pitch.
Hit Batsmen -- The number of batters hit by a pitch.
Hold -- A relief pitcher is credited with a hold any time he enters a game in a save situation, records at least one out and leaves the game never having relinquished the lead. A pitcher cannot finish the game and receive credit for a hold, nor can he earn a hold and a save in the same game.
Home Run -- A batter is credited with a home run when he hits the ball over the outfield fence in fair territory, or hits it into play and subsequently scores on the play without an intervening error.
Homer -- A home run. Other terms include: blast, dinger, dong, four-bagger, four-base knock, moon shot, tape-measure blast and tater.
Hot Corner -- Third base.
HR -- See "Home Run"; abbreviation for home run.

IBB -- See "Intentional Walk"; abbreviation for intentional bases on balls.
In The Hole -- The batter after the on-deck hitter.
Inherited Runners -- Total amount of runners when a relief pitcher is entered into play.
Inherited Runs Allowed -- A relief pitcher is charged with an inherited run allowed when he enters the game with a runner or runners on base and one or more of those runners scores while that relief pitcher is in the game.
INN -- See "Innings Played"; abbreviation for innings played.
Innings Pitched -- The total number of innings pitched by the pitcher. The pitcher is credited for one-third inning for each out he records.
Innings Played -- The total number of innings played by a fielder. The fielder is credited for one-third inning for each out recorded while he is on the field defensively.
IP -- See "Innings Pitched".
IR -- See "Inherited Runners".
Intentional Walk -- A batter is credited with an intentional base on balls (intentional walk) when the pitcher throws four pitches outside of the strike zone during one plate appearance, and the pitcher makes no attempt to throw the last pitch to the batter into the strike zone but purposely throws the ball wide to the catcher outside the catcher's box.

Jam -- When a hitter gets a pitch near his hands, he is "jammed." Also when a pitcher gets himself in trouble, he is in a "jam."

L -- See "Loss(es)". Abbreviation for losses. Used in scorekeeping.
Late Inning Pressure Situations -- The batter's batting average in Late Inning Pressure Situations, which is any at-bat in the seventh inning or later, with the batting team either leading by one run, tied, or has the potential tying run on base, at bat, or on deck.
Leather -- Refers to how good a player plays defensively or handles the glove. Ex: "He flashed some leather on that play."
Left Field -- A player desiganted to play the left side of the outfield. Assigned #7 in fielding plays.
Left On Base -- The total number of baserunners who were on base by any means, and did not score and/or were not put out, during all at-bats in which the batter made an out.
LF -- See "Left Field".
LIPS -- See "Late Inning Pressure Situations"; abbreviatin for late inning pressure situations.
LOB -- See "Left On Base"; abbreviation for left on base.
Loss(es) -- The total number of losses charged to the pitcher. A pitcher is charged with the loss of the game if he is replaced when his team is behind in the score, or falls behind because of runs charged to him after he is replaced, and his team thereafter fails either to tie the score or gain the lead, regardless of how many innings he has pitched.

Meatball -- An easy pitch to hit, usually right down the middle of the plate.
Mendoza Line -- A batting average of around .200.
Moon Shot -- A very long, high home run.

Nail Down -- As in "nail down a victory." Refers to a relief pitcher finishing off the game.
NP -- See "Number Of Pitches"; abbreviation for number of pitches.
Number Of Pitches -- 1) Amount of total pitches the batter has seen in one plate appearence. 2) The number of pitched the pitcher has thrown to one batter per plate appearence.

OBP -- See "On Base Percentage"; abbreviation for on base percentage.
OF -- See "Outfield" 2) See "Outfielder".
OFA -- See "Outfield Assist(s)"l abbreviaiton for outfield assists.
On Base Percentage -- Divide the total number of hits, bases on balls and times hit by pitch by the total of at-bats, bases on balls, times hit by pitch and sacrifice flies.
On Base Percentage Plus Slugging Percentage -- Add the on-base percentage and slugging percentage, treating both numbers as integers.
On the screws -- When a batter hits the ball hard. Also "on the button."
Oofer -- Slang for "Oh-for". Used as a sarcastic insult to a player who did not reach base during the game. "Alex Rodriguez pulled an oofer oint four at bats with two strike outs and two ground outs."
OPS -- See "On Base Percentage Plus Slugging Percentage"; abbrevition for on base percentage plus slugging percentage.
Outfield -- The large area behind the infield consisting of three fielders.
Outfielder -- One of the three designated players in the outfield.
Outfield Assist(s) -- An outfielder is credited with an assist when he throws or deflects a batted or thrown ball in such a way that a putout results, or would have resulted except for a subsequent error by any fielder.

P -- See "Pitcher".
Painting The Black -- When a pitcher throws the ball over the edge of the plate.
Passed Ball(s) -- A catcher is charged with a passed ball when he fails to hold or to control a legally pitched ball that should have been held or controlled with ordinary effort, thereby permitting a runner or runners to advance.
Pea -- A ball traveling at high speed, either batted or thrown.
PB -- See "Passed Ball(s)"; abbreviation for passed ball(s). Also used in scorekeeping.
Pepper -- Pepper is a common pre-game exercise where one player bunts brisk grounders and line drives to a group of fielders who are standing about 20 feet away. The fielders try to throw it back as quickly as possible. The batter hits the return throw. (Some ballparks ban pepper games because wild pitches could land in the stands and injure spectators).
Pick -- A good defensive play by an infielder on a ground ball. Also a shortened version of "pick-off."
Pickle -- A rundown.
Pitcher -- The player who throws the ball at the opposition in an attempt to prevent the player from reaching base.
PO -- See "Put Out(s)"; abbreviation for put out(s).
Punchout -- A strikeout.
Put Out(s) -- when a fielder catches a fly ball or a line drive, whether fair or foul, catches a thrown ball which puts out a batter or runner, or tags a runner when the runner is off the base to which he legally is entitled.

R -- See "Run(s) Scored"; abbreviation for run(s) scored. Also used in scorekeeping.
RBI -- See "Run(s) Batted In"; abbreviation for runs batted in. Also used in scorekeeping.
Range Factor -- Add the total number of putouts and assists recorded by the fielder, multiply that total by nine, and divide by the number of innings played.
Relief Pitcher -- Any pitcher who replaces the pitcher before him. Usually the final pitcher of the game is referred as the closer.
RF -- 1)See "Right Fielder". 2) See "Range Factor".
Rhubarb -- A fight or scuffle.
Ribbie -- 1) Another way of saying RBI. Also "ribeye." 2) See Run(s) Batted In".
Right Fielder -- A player designated to play the right side of the outfield. Assigned #9 in fielding plays.
Rope -- A hard line drive hit by a batter. Also "frozen rope."
RP -- See "Relief Pitcher".
Rubber Game -- The deciding game of a series.
Run(s) Batted In -- A batter is awarded an RBI on any run that scores as a direct result of a single, double, triple or home run; on a sacrifice fly or a sacrifice bunt on which a runner scores from third base; on a groundout (with less than two outs) on which a runner scores from third base; or on a hit-by-pitch or walk with the bases loaded.
Run(s) Scored -- The total number of runs scored by the player.
Run-Down -- When a baserunner gets caught between bases by the fielders.
Ruthian -- With great power.

SAC -- Also written as "Sac". See "Sacrifices". Used in verbal communication meaning to sacrifice. i.e.: "That sac fly drove in a run to tie the game".
Sacrifice -- A batter is credited with a sacrifice when, before two are out, the batter advances one or more runners with a bunt or fly ball and is put out at first base or if the fly ball is caught, or would have been put out except for a fielding error.
Save(s) -- A pitcher is credited with a save when he finishes a game won by his club, is not the winning pitcher, and either (a) enters the game with a lead of no more than three runs and pitches for at least one inning, (b) enters the game with the potential tying run either on base, or at bat, or on deck, or (c) pitches effectively for at least three innings.
Save Opportunity (-ies) -- A pitcher is credited with a save opportunity when he enters the game with a lead of no more than three runs or with the potential tying run either on base, or at bat, or on deck.
SB -- See "Stolen Base(s)". Abbreviation for stolen base. Also used in scorekeping.
Second Baseman -- Fielder designated to play at second base. Assigned #4 in fielding plays.
Seeing-Eye Single -- A soft ground ball that finds its way between infielders for a base hit.
Set-Up Man -- A relief pitcher who usually enters the game in the 7th or 8th inning.
SHO -- See "Shutouts".
Shoestring Catch -- A running catch made just above the fielder's shoetops.
Shortstop -- Played designated to play in the shortstop position (roughly halfway between second and third base). Assigned #6 in fielding plays.
Shutouts -- A pitcher is credited with a shutout when he pitches a complete game without allowing a run. When two or more pitchers combine to pitch a shutout, neither shall be awarded a shutout.
SLG -- See "Slugging Percentage"; abbreviation for slugging percentage.
Slugging Percentage -- Divide the total bases recorded by the batter by the total number of at-bats.
SO -- See "Strikeout(s)"; abbreviation for strikeout(s). Also used in scorekeeping.
Southpaw -- A left-handed pitcher.
SS -- See "Shortstop".
Stolen Base(s) -- A runner is credited with a stolen base when he advances to the next base, without the ball being hit into play, and unaided by a hit, a putout, an error, a force out, a fielder's choice, a passed ball, a wild pitch or a balk.
Strikeout(s) -- 1) A batter is charged with a strikeout when three strikes are recorded against him by the pitcher. 2) A pitcher is awarded a strike out when three strikes are recorded agianst the batter.
SV -- See "Save(s)". Abbreviation for saves. Used in scorekeeping.
SVO -- See "Save Opportunity(-ies)". Abbreviation for save opportnity.
Sweet Spot -- The part of the bat just a few inches from the barrel.

Table Setter -- Batter whose job is to get on base for other hitters to drive him in. Usually a leadoff or No. 2 hitter.
Tape-Measure Blast -- An extremely long home run.
Tater -- A home run.
TB -- See "Total Bases"; abbreviation for total bases.
TC -- See "Total Chances".
Texas Leaguer -- A bloop hit that drops between an infielder and outfielder.
Third Baseman -- Fielder designated to play at third base. Assigned #5 for fielding plays.
Total Chances -- The total number of putouts and assists credited to the fielder and errors charged to the fielder.
Tools Of Ignorance -- Catcher's equipment.
Touch 'em all -- Hitting a home run (touching all the bases).
TP -- See "Grounded Into Triple Play".
TPA -- See "Total Plate Apprearences"; abbreviation for total plate appearences.
Triple -- A batter is credited with a triple when he hits the ball into play and safely reaches third base without an intervening error or attempt to put out another baserunner.
Total Bases -- A batter is credited with one total base for each single, two total bases for each double, three total bases for each triple and four total bases for each home run.
Total Plate Apprearences -- Add the total number of at-bats, bases on balls, times hit by pitch and sacrifice flies.
Twin Killing -- A double play.

Uncle Charlie -- Curve ball.
Unearned Run(s) -- A run that scores shall be unearned if the runner reaches first base after his time at bat is prolonged by a muffed foul fly, because of interference or obstruction or because of any fielding error. No run shall be earned when scored by a runner whose time on base is prolonged by an error, if such runner would have been put out by errorless play, or if the runner's advance is aided by an error, a passed ball, or defensive interference or obstruction, if the scorer judges that the run would not have scored without the aid of such misplay.
Utility Player -- A player who fills in at many positions.

W -- See "Win(s)". Abbreviation for wins. Used in scorekeeping.
Walk -- see "Bases On Balls"
Wheelhouse -- A hitter's power zone. Usually a pitch waist-high and over the heart of the plate.
Wheels -- A ballplayer's legs.
Whiff -- Strikeout.
WHIP -- Divide the total number of hits and bases on balls (walks) allowed by the pitcher by his total number of innings pitched.
Wild Pitches -- A pitcher is charged with a wild pitch when his pitch is so high, or so wide, or so low that the catcher does not stop and control the ball by ordinary effort, thereby permitting a runner or runners to advance.
Win(s) -- The starting pitcher is credited with a win if he has pitched at least five complete innings and his team not only is in the lead when he is replaced but remains in the lead the remainder of the game. When the starting pitcher is not credited with the win, the win shall be awarded to the relief pitcher judged by the scorer to have been the most effective, or who is the pitcher of record when his team assumes the lead and maintains it to the finish of the game.
Winning Percentage -- Divide the number of wins awarded to the pitcher by the total of wins and losses credited to the pitcher.
WP -- See "Wild Pitches". Abbreviation for wild pitches. Used inscorekeeping.

XBH -- See "Extra Base Hit(s)"; abbrevition for extra base hit(s).

Yakker -- Curve ball.