From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :
COFF
Common Object File Format (Unix)
From The Free On-line Dictionary of Computing (30 December 2018) :
Common Object File Format
COFF
(COFF) The executable file and object file
format used by Unix System V Release 3 and later.
Unix manual page: coff(5).
(2007-08-15)