PK is short for Pick, or Pick ‘em.
When you see that on an NFL betting line, it means the game is considered to be even. For example, if the New York Giants are playing the New York Jets and the line is PK, that means it’s considered a toss-up. There is no point spread. So whatever team you bet on, the Giants or the Jets, just has to win the game for you to win your bet.
A PK line means oddsmakers see the two teams as dead even.
“Pick’’ games don’t happen very often in the NFL. In the entire 2018 regular season (256 games), there were only six games where the line closed as a Pick. There were no “Pick’’ games in the NFL playoffs in 2018.