The Free On-line Dictionary of Computing (30 December 2018):

Report Program Generator
RPG-II

    (RPG) An IBM programming language developed by Wilf
   Hey at IBM in 1965 for easy production of sophisticated
   large system reports.

   RPG is a 3GL similar to COBOL, but more concise and
   supposedly easier for non-programmers to use.  It processes
   its input one line at a time and does not treat tables as
   conceptual entities.

   It was popular on System 34/36 minicomputers.

   Versions: RPG II, RPG III, RPG/400 for IBM AS/400.  MS-DOS
   versions by California Software and Lattice.  Unix
   version by Unibol.  Cross-platform version by J & C
   Migrations runs on MS-DOS, Windows, AIX, HP-UX, and
   OS/390.

   See also CL, OCL.

   (2004-08-24)