Year: The year of the stats. The year is a link that goes to league's Year in Review page.
Team: The name of the team. The Team link goes to a comprehensive team roster.
G: Games. Tells how many games the pitcher actually took the mound in and tossed at least one pitch. IMPORTANT NOTE: If the data in the G column is a dark maroon link, click it and up will appear comprehensive pitching logs that show every game the pitcher appeared in and links to those boxscores.
GS: Games Started. The number of times the pitcher was given the ball to start a game.
GF: Games Finished. The number of times the pitcher was throwing on the mound during the final out. Could be a game they were in as relief, earned a save, or even a loss.
W: Wins. How many victories was the pitcher given credit for by the scorer.
L: Losses. How many games were lost by the pitcher.
PCT: Winning Percentage. The number of wins divided by (Wins plus losses).
ERA: Earned Run Average. The number of (ER - Earned Runs x 9) then divided by the number of Innings Pitched (IP).
CG: Complete Games. Credited when the pitcher throws the entire game without any relief.
SHO: Shutouts. A complete game (CG) game thrown by the pitcher where the losing team did not score.
SV: Saves. Earned by a pitcher when a. He is the finishing pitcher in a game won by his team. b. he is not the pitcher who earned the win (W). c. he meets one of the following criteria: 1. He came to the mound with a lead less than four and pitches at least one inning. 2. He came to the mound with the tying run on base, at bat, or on deck. 3. He pitches effectively for at least three innings.
IP: Innings Pitched. The number of innings pitched with decimals for added accuracy. A pitcher with 3.1 innings pitched had three full innings of work then retired one batter in his fourth inning of work.
BFP: Batters Facing Pitcher. The total number of batters who came to the plate while the pitcher was on the mound.
H: Hits Allowed. Total number of hits given-up.
ER: Earned Runs. The number of earned runs (those which scored without the aid of an error, a catcher's interference call, or a passed ball) allowed by the pitcher.
R: Runs Allowed. A total number of runs, earned (ER) or not earned, that scored.
HR: Home Runs Allowed. Pitches that were hit by batters which were scored as a home run.
BB: Base on Balls. The number of walks the pitcher issued to batters.
IBB: Intentional Base on Balls. Counts the number of times a walk was issued with no intent of ever allowing a hit.
SO: Strikeouts. Number of batters faced which struck out during their at-bat.
WP: Wild Pitches. Charged by the scorer only if a runner advances a base and the pitched ball was so out-of-the-zone that it could not be controlled with an ordinary amount of effort.
HBP: Hit by Pitch(er). Total number of batters struck by the pitcher whether or not it was intentional.
BK: Balks. A call against the pitcher for making an illegal motion that the umpire views as an attempt to deceive a baserunner.
HLD: Holds. A stat awarded to a relief pitcher who enters with the lead and does not relinquish it.