design system language

from The Free On-line Dictionary of Computing (8 July 2008)

Design System language

   J. Gaffney, Evans & Sutherland 1976.  Interpretive FORTH-like
   language for 3d graphics databases.  Earliest forerunner of
   both Interpress and PostScript.  Mentioned in PostScript
   Language Reference Manual, Adobe Systems, A-W 1985.