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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Computer Graphics Metafile
   CGM
      <graphics, file format> (CGM) A standard file format for
      storage and communication of graphical information, widely
      used on personal computers and accepted by desktop
    publishing and technical illustration systems.
      MIME type: image/cgm.
      ANSI/ISO 8632-1987.  Worked on by the ISO/IEC group
      JTC1/SC24.
      CGM Open Consortium (http://cgmopen.org/).
      See also: WebCGM.
      (1999-02-16)