Wiktionary
slash line
n. 1 (context baseball English) The batting average, on-base percentage, and slugging average of a batter or team when expressed together, separated by slashes. 2 (context baseball English) The batting average, on-base percentage, and slugging average of batters that have had plate appearances against a pitcher or team.
Usage examples of "slash line".
Something moved on the far side of the slash line, and his eye darted to the movement.