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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   SLIP
      1. Serial Line Internet Protocol.
      2. Symmetric LIst Processsor.  Early 1960's list processing
      subroutine package for Fortran by J. Weizenbaum.  Later also
      embedded in MAD and ALGOL.  ["Symmetric List Processor",
      J. Weizenbaum CACM 6:524-544(1963).  Sammet 1969, p.387].