Portable Operating System | for

FoR
abbr. UN gen.	fields of regards
for
abbr.	force; forensic; free of tax
for.
abbr. dril.	free on rail
abbr. earth.sc.	foreign; forest; formation; formula

| unIX

UNIX
abbr.	The United Nations Intelligent Xylophone; Not an acronym at all.; Orginally UNICS, for Uniplex Information and Computing System
abbr. el.	a multiuser time-sharing system