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F/M
abbr., el.	frames per minute
abbr., IT	fax/modem
abbr., logist.	freight manifest
abbr., mil.	flight manual
abbr., O&G, casp.	female or male (Yeldar Azanbayev)
F.M.
abbr.	Field Marshal
abbr., earth.sc.	feasibility model; field magnet
abbr., econ.	force majeure
F&M
abbr., mil., avia.	forces and moments
f.m.
abbr., commer.	fair market value
abbr., econ.	fully middling
abbr., tech.	frequency modulation
polym.	fair merchantable

F/M: 2 phrases in 1 subject

Abbreviation

2