PF probably means punt formation. This is a formation in which you have (normally) 2 gunners lined up on the outsides who's job is to be the first ones to reach the punt receiver and hopefully tackle the receiver, or down the ball as close to the goal line as possible. The remaining 8 men will line up on the line of scrimmage similar to a regular formation (not all 8 will be literally on the line of scrimmage) whos job it is to block long enough for the punter to make a successful punt, after which they assist in punt coverage. I would imagine that could also be a typo for FP, which would be forward pass. What is the context in which it was used? Can you provide more information?
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If in stats for points, PF would stand for Points For.
If in stats for penalties, PF would stand for Personal Fouls.
Points For, the cumulative number of points scored by a team for the season. PA, is Points Against, the cumulative number of points scored against a team for the season.