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

Prograph

   

   A visual dataflow programming language and environment from
   the Technical University of Halifax.

   Prograph is an entirely graphical visual programming
   language, other than for the text of method names, and
   supports the program development process in a
   highly-interactive fashion.  Operation icons are connected by
   data links through which information flows.  It supports
   object orientation via class-based data abstraction with
   single inheritance.

   Prograph is available for the Macintosh, and soon for
   Windows and Unix, from TGS Systems.

   (1995-03-31)