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

Parallel Virtual Machine
PVM

    (PVM) 1. A software system
   designed to allow a network of heterogeneous machines to be
   used as a single distributed parallel processor.

   PVM was developed by the University of Tennessee, The Oak
   Ridge National Laboratory and the Emory University.

   (http://epm.ornl.gov/pvm/).

   Usenet newsgroup: news:comp.parallel.pvm.

   2. The intermediate language used by the Gambit compiler for
   Scheme.

   [And Multilisp?]

   (1995-01-30)