Abbreviation for “pre-flop raise”, which specifies how often someone raises before the flop. An aggressive player will have a higher PFR as they will be raising a lot of hands. This poker term is often used in poker tracker programs and when used in conjunction with VPIP it tells you a lot about an opponent’s pre-flop tendencies.
EXAMPLE “An aggressive player with a PFR of 40% on the BTN raised my big blind as I expected him to do.”