On-Base Plus Slugging. So it is a combination of a players On-Base Percentage (OBP) and their Slugging Percentage (SLG). For example, if a player has a .448 OBP and a .613 SLG they would have an OPS of 1.061.
On-Base Plus Slugging (Percentage)
On base percentage plus slugging percentage
Runs
Strikeout
at bats
Assists
Runs batted in.
Wealthy As Rich
strikeout
errors in the field
Plate Appearances
Men on base