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

The Real-Time Operating System Nucleus
Real-Time Operating System Nucleus

    (TRON) A project to develop an operating system
   and man-machine interface that can work with other operating
   systems to provide an environment for many small distributed
   computers to cooperate in real time.  TRON is headed by
   Dr. Ken Sakamura of the University of Tokyo and supported by
   most of the major Japanese computer makers and NTT.

   (http://atip.org/public/atip.reports.91/tron.html).

   (2003-05-23)