1B% = singles per 100 at-bats

2B = doubles

2B% = doubles per 100 at-bats

3B = triples

3B% = triples per 100 at-bats

HR = home runs

HR% = home runs per 100 at-bats

RBI = runs batted in

RBI% = runs batted in per 100 at-bats

AVG = batting average

OBP = On Base Percentage Sometimes referred to as On Base Average 'OBA', this is a measure of how often a batter reaches base for any reason other than a fielding error, fielder's choice, fielder obstruction, or catcher interference (hits + walks + hit-by-pitch) divided by (at bats + walks+ hit-by-pitch + sac flies).

SLG = slugging % The total of singles (1 pt), doubles (2 pts), triples (3 pts), and home runs (4 pts) divided by total at-bats x 1000. A player with 1 single, 1 double, 1 triple, and 1 home run in 8 at-bats earns a slugging % of 1250 (1+2+3+4=10), divided by total at-bats (8) = 1.25 x 1000 = 1250.
3AVG = 3 Game Average This is the batting average of a player's last 3 games.

BB = bases on balls
SACF = Sacrifice Fly This occurs when a runner tags up and scores as a result of a batted fly ball out (or fly ball error if in the judgment of the scorekeeper the runner would have tagged up and scored had the fly ball been caught)
RUNC = Runs Created This is an estimate of how many runs have resulted from what a player has done with the bat and on the base paths [(total bases) + (walks x .26) + (sac flies x .52)] x on-base percentage.

TB = Total Bases This refers to the number of bases a player has gained with hits. The total is calculated using 1 point for a single, 2 points for a double, 3 points for a triple and 4 points for a home run. Only bases attained from hits count toward this total.

Defensive Categories (pre-2011)

PO = put-outs*

*a put-out is a recorded out by the fielder in any of the following scenarios…
a) caught fly ball, b) ground ball – step on the bag or tag the runner, c) receive a throw from another fielder for a tag or force-out, d) strike out – recorded for the pitcher, e) caught leaving the bag early – recorded for first, second, or third baseman

POg = put-outs per game

A = assists*

*an assist is a recorded out by the fielder in any of the following scenarios…
a) infielder picks up a ground ball and throws to first – infielder receives an assist, first baseman receives a put-out, b) infielder picks up a ground ball, steps on a base to force a runner and throws to first to get the batter – infielder gets a put-out and an assist, the first baseman gets a put-out, c) any fielder throwing a runner out at any base receives credit for an assist and the baseman receives a credit for a put-out, d) a ball is tipped off the glove of let’s say the pitcher and the shortstop catches it in the air – pitcher gets an assist, shortstop gets a put-out

Ag = assists per game

ERR = errors

F% = fielding %*

*fielding percentage is a reflection of a player’s total defensive production based on the number of games played. This statistic is player-position sensitive meaning certain defensive positions will consistently produce higher numbers. In essence, a middle infielder’s F% will usually be higher than other defensive positions because of the greater opportunity for put-outs and assists. A general rule of thumb indicating good defensive production per position would be as follows…

Outfielders – 175+
3rd baseman – 300+
1st baseman – 350+
Pitcher - 350+
2nd baseman – 400+
Shortstop – 450+