Advanced glossary

Also view explanations by holding mouse over column headers
Rk -- Rank
Pos -- Position
Age -- Player's age on February 1 of the season
Tm -- Team
G -- Games
MP -- Minutes Played

PER -- Player Efficiency Rating: "The PER sums up all a player's positive accomplishments, subtracts the negative accomplishments, and returns a per-minute rating of a player's performance."
https://www.basketball-reference.com/about/per.html

TS% -- True Shooting Percentage: PTS / (2 * TSA)
PTS - points, TSA - True Shooting Attempts; the formula is FGA + 0.44 * FTA.

A measure of shooting efficiency that takes into account 2-point field goals, 3-point field goals, and free throws.
3PAr
▲ -- 3-Point Attempt Rate
Percentage of FG Attempts from 3-Point Range
FTr -- Free Throw Attempt Rate
Number of FT Attempts Per FG Attempt
ORB% -- Offensive Rebound Percentage
An estimate of the percentage of available offensive rebounds a player grabbed while they were on the floor.
DRB% -- Defensive Rebound Percentage
An estimate of the percentage of available defensive rebounds a player grabbed while they were on the floor.
TRB% -- Total Rebound Percentage
An estimate of the percentage of available rebounds a player grabbed while they were on the floor.
AST% -- Assist Percentage
An estimate of the percentage of teammate field goals a player assisted while they were on the floor.
STL% -- Steal Percentage
An estimate of the percentage of opponent possessions that end with a steal by the player while they were on the floor.
BLK% -- Block Percentage
An estimate of the percentage of opponent two-point field goal attempts blocked by the player while they were on the floor.
TOV% -- Turnover Percentage
An estimate of turnovers committed per 100 plays.
USG% -- Usage Percentage
An estimate of the percentage of team plays used by a player while they were on the floor.
OWS -- Offensive Win Shares
An estimate of the number of wins contributed by a player due to offense.
DWS -- Defensive Win Shares
An estimate of the number of wins contributed by a player due to defense.
WS -- Win Shares
An estimate of the number of wins contributed by a player.
WS/48 -- Win Shares Per 48 Minutes
An estimate of the number of wins contributed by a player per 48 minutes (league average is approximately .100)
OBPM -- Offensive Box Plus/Minus
A box score estimate of the offensive points per 100 possessions a player contributed above a league-average player, translated to an average team.
DBPM -- Defensive Box Plus/Minus
A box score estimate of the defensive points per 100 possessions a player contributed above a league-average player, translated to an average team.
BPM -- Box Plus/Minus
A box score estimate of the points per 100 possessions a player contributed above a league-average player, translated to an average team.
VORP -- Value over Replacement Player
A box score estimate of the points per 100 TEAM possessions that a player contributed above a replacement-level (-2.0) player, translated to an average team and prorated to an 82-game season.

Multiply by 2.70 to convert to wins over replacement