Official Baseball Stat Abbreviations

Hitting Stats

2B - Doubles
3B - Triples
AB - At Bats
AB/HR - At Bats per Home Run
AB/RBI - At Bats per Runs Batted In
AO - Fly Outs
AVG - Batting Average
BABIP - Batting Average on Balls In Play
BB - Bases on Balls (Walks)
BWS - Batting Win Shares
CS - Caught Stealing
G - Games Played
GDP - Grounded into Double Play
GO - Ground Outs
GO/AO - Ground Out / Fly Out Ratio
H - Hits
HBP - Hit by Pitch
HR - Home Runs
HR% - Home Run Percent
IBB - Intentional Walks
K - Strikeouts
OBP - On-Base Percentage
OPS - On-Base Plus Slugging
OWS - Offensive Win Shares
PA - Plate Appearances
R - Runs Scored
RBI - Runs Batted In
RC - Runs Created
SB% - Stolen Base Percentage
SB - Stolen Bases
SF - Sacrifice Flies
SH - Sacrifice Hits
SLG - Slugging Average
TA - Total Average
TB
- Total Bases
XBH - Extra Base Hits

Fielding Stats

A - Assists
A/G - Assists per Game
DE - Defensive Efficiency
DP - Double Plays
DP/G - Double Plays per Game
E - Errors
FR - Fielding Runs
FWS - Fielding Win Shares
G - Games Played
GS - Games Started
INN - Innings Played
INNOUTS - Outs Played (= INN*3)
OFA - Outfield Assists
PB - Passed Balls
PCT - Fielding Percentage
PO - Putouts
RF - Range Factor
RTO - Runners Thrown Out (by catcher)
RTO% - Runners Thrown Out Percent (RTO/SBA)
SBA - Stolen Bases Attempted (versus catcher)
SB% - Stolen Base Percent (allowed by catcher)
SB/9 - Stolen Bases Allowed / 9 Innings
TC - Total Chances
TP - Triple Plays
ZR - Zone Rating

Pitching Stats

2B - Doubles allowed
3B - Triples allowed
AO - Fly Outs
AVG - Opponents Batting Average
BABIP - Batting Average on Balls In Play
BB - Bases on Balls (aka 'Walks')
BB/9 - Walks per 9 innings
BR/9 - Baserunners allowed per 9 innings
BF - Batters Faced
BK - Balks
BS - Blown Saves
CERA - Component ERA
CG - Complete Games
CS - Caught Stealing
DICE - Defense-Independent Component ERA
ER - Earned Runs allowed
ERA - Earned Run Average
G - Games Pitched (aka 'Appearances')
GB - Ground Balls (includes hits and outs)
GF - Games Finished
GIDP - Double Plays Induced
GO - Ground Outs
GO/AO - Ground Out / Fly Out Ratio
GS - Games Started
H - Hits allowed
H/9 - Hits allowed per 9 Innings
HB - Hit Batters
HD - Holds
HR - Home Runs allowed
IP/G - Innings Pitched per Game
IBB - Intentional Walks
IP - Innings Pitched
IR - Inherited Runners
IRA - Inherited Runs Allowed
K - Strikeouts
K/9 - Strikeouts per Nine Innings
K/BB - Strikeout / Walk Ratio
L - Losses
OBA - Opponent Batting Average
OOBA - Opponent On-Base Average
OOPS - Opponent On-Base Plus Slugging
OSA - Opponent Slugging Average
PCT - Winning Percentage
PIT - Number of Pitches Thrown
PK - Pickoffs
PWS - Pitching Win Shares
R - Runs allowed
RW - Relief Wins
SB - Stolen Bases
SO - Shutouts
SV - Saves
TB - Total Bases
TP - Triple Plays
UR - Unearned Runs allowed
W - Wins
WHIP - (Walks + Hits) / Innings Pitched
WP - Wild Pitches
XBH - Extra Base Hits Allowed

Miscellaneous Stats

WS - Win Shares