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R.F.
abbr.	Raised-face (A Hun)
abbr., commer.	rente francaise; revenu fixe; Rockefeller Foundation
abbr., earth.sc.	radio-frequency; range finder; range finding; reducing flame
abbr., oil	radio frequency
abbr., slang	rat fink; rat fuck; royal fuck
R/F
abbr., auto.	reinforcement
abbr., busin.	received and forwarded
mil.	reserve force
R&F
abbr., adv.	reach and frequency
abbr., mil., avia.	rank and file
r.f.
abbr.	replacement factor
abbr., libr.	rough finish (paper)
abbr., photo.	rising front; roll film; rangefinder
qual.cont.	random function
R-f
abbr., earth.sc.	reef
R & F
abbr.	rank and file
r-f
abbr.	radio frequency
R F
abbr., med.	ratio of the distance moved by a particular solute to that moved by the solvent front

R: 22 phrases in 3 subjects

Abbreviation	20
Chemistry	1
Rail transport	1