V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GKS
       Graphic Kernel System


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

Graphical Kernel System
GKS

    (GKS) The widely recognised standard
   ANSI X3.124 for graphical input/output.  GKS is worked on by
   the ISO/IEC group JTC1/SC24.  It provides applications
   programmers with standard methods of creating, manipulating,
   and displaying or printing computer graphics on different
   types of computer graphics output devices.  It provides an
   abstraction to save programmers from dealing with the detailed
   capabilities and interfaces of specific hardware.

   GKS defines a basic two-dimensional graphics system with:
   uniform input and output primitives; a uniform interface to
   and from a GKS metafile for storing and transferring
   graphics information.  It supports a wide range of graphics
   output devices including such as printers, plotters,
   vector graphics devices, storage tubes, refresh
   displays, raster displays, and microfilm recorders.

   (1999-04-01)