(grammar) Abbreviation of perfect. / (grammar) Abbreviation of perfective aspect.

Initialism of pilot flying., a pilot currently in control of the flight trajectory of the aircraft, as opposed to pilot monitoring / (physics) Initialism of peak flow.

(electronics) Initialism of power factor. / pff

(cryptography) Initialism of perfect forward secrecy. / (medicine) Initialism of progression-free survival. / (dermatology) Initialism of pyoderma fistulans sinifica.

(space science, ESA) Initialism of Planetary Fourier Spectrometer.

Abbreviation of programmed (or programmable) function key.

Abbreviation of Zimbabwe African National Union – Patriotic Front. (political party in Zimbabwe)

plural of PF key

Alternative form of P/F ratio

plural of P/F ratio