Wiktionary
pf
n. (context electronics English) power factor.
Wikipedia
PF (firewall)
PF
PF may refer to:
Usage examples of "pf".
Then he heard the dhol of the PFs, the steady four-beat they marched and fought to, based on the traditional four-four beat to which all Arya rituals were conducted by Vedic custom.
And at the right time, she would have sent out a mantra to inflame that masth elephant, panicking the horses of the PFs on Raghuvamsha Avenue and causing a stampede.