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P/F
abbr.	pass/failure (MichaelBurov); Poll/Final (HDLC)
abbr., IT	Poll/Final Bit
abbr., mil.	Pass/Fail (WiseSnake)
abbr., tech.	Pass/Fail. (MichaelBurov)
abbr., telecom.	poll/final
P&F
abbr.	plumber and fitter
abbr., logist.	packing and fright (упаковка и фрахт Izuminka2008)
abbr., oil	petroleum and fuel; pump and flow
energ.ind.	projects and facilities
P.F.
abbr., commun.	Packet Fabric (Broadband Switching Matrix in Alcatel 1000 MM)
abbr., earth.sc.	position finder
abbr., tech.	pico-farad
P-F
abbr., met.	penetration fracture
p.f.
abbr.	pro forma; plain face; plastic-film; pulse frequency
construct.	plane face
met.	power factor
P & F
abbr.	petroleum and fuel; planning and forecasting

P/F: 4 phrases in 1 subject

Abbreviation

4