Below is a list of Baseball Abbreviations
Pitching Stats

G  Games Played

GS  Games Started

IN  Innings Pitched

PIT  Number Of Pitches Thrown

K  Strikeouts Induced

BB  Base on Balls Allowed

IBB  Intentional Base on Balls Allowed

H  Hits Allowed

D  Doubles Allowed

T  Triples Allowed

HR  Homeruns Allowed

R  Runs Allowed

RS  Runners Stranded

DP  Double Plays Induced

DPO  Double Play Opportunities (likely opportunities to hit into a double play, ie runner of first and less than 2 outs)

W  Wins

L  Losses

S  Saves

BS  Blown Saves

HLD  Hold

QS  Quality Starts (Starting pitcher allows less than 4 runs and pitches for at least 6 innings.)

SUP  Run Support Per 9 Innings

ERA  Earned Run Average

AVG  Batting Average Against

OBP  On Base Percentage Against

SLG  Slugging Percentage Against

WP  or Walk Percentage is the percent of plate appearances resulting in a walk **

KP  or Strikeout Percentage is the percent of plate appearances resulting in a strikeout **

HRP  or Home Run Percentage is the percent of plate appearances resulting in a home run **

SBP  or Stolen Base success Percentage is the percent of steal attempts that are successful **

wOBA  or Weighted On Base Average is a measure of the total run value of nearly all player stats within the league's context

wRAA  or Weighted Runs Above Average is based on wOBA and is a measure of the total number of runs the player produced relative to the average player in the league (positive values are good, negative bad)

ER  earned run allowed

W%  percentage of a pitcher's decisions that are wins (wins / (wins+losses)).

S%  percentage of a pitcher's save opportunities that are successfully converted.

G/F = Ratio of ground balls to fly balls

WO  Win opportunities

RV  run value relative to that of an average pitcher facing average hitters

IR  Inherited runners allowed to score

IRS  Inherited runners stranded

IR%  Percent of inherited runners stranded

DP%  Percent of double play opportunities successfully converted (percent of times there is a runner on first with less than 2 outs that turns into a double play)
Batting Stats

G  Games Played

AB  At Bats

K  Strikeouts

BB  Base on Balls

IBB  Intentional Base on Balls

H  Hits

D  Doubles

T  Triples

HR  Homeruns

R  Runs Scored

RBI  Runs Batted In

LOB  Runners Left On Base

SB  Stolen Bases (stolen bases not yet in sim)

CS  Caught Stealing

BRO  Base Running Outs

DP  Double Plays Hit Into

DPO  Double Play Opportunities (likely opportunities to hit into a double play, ie runner of first and less than 2 outs)

AVG  Batting Average

OBP  On Base Percentage

SLG  Slugging Percentage

OPS  On Base + Slugging Percentage

SVP  or Save Percentage is the percent of save attempts that are successful **

FB/GB  the fly ball, ground ball ratio (the inverse of GB/FB) **

GB/FB  the fly ball, ground ball ratio (the inverse of FB/GB)**
Fielding Stats

PO  Number of put outs

A  Number of assists

ERR  Number of errors committed

FERR  Number of fielding errors committed

TERR  Number of throwing errors committed (not currently used)

CERR  Number of catching errors committed (not currently used)

FP  Fielding percentage

CI  Catcher interference

PB  Passed balls

BZ  Number of balls hit to player's zone

BZO  Numbers of balls hit ot player's zone that turned into outs

BZ%  Percentage of balls hit to a player's zone that turned into outs

DPT  Double plays turned

DPO  Number of opportunities to begin turning a double play

DPI  Number of opportunities to begin turning a double play successfully converted

STA  Number of runners allowed to steal

CS  Number of runners caught stealing
Much of the above abbreviations were lazily borrowed from BigBossman007's post in the newbie forum. Further information on baseball abbreviations can be found here and here.
** The ideas for the stats are common, the abbreviations may be unique to Brushback Baseball.
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