V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ISL
       Inter-Switch Link (FC)


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

ISL

   Interface Specification Language.  Xerox PARC.  Interface
   description language used by the ILU (Inter-Language
   Unification) system.  Includes descriptions of multiple
   inheritance, exceptions and garbage collection.

   E-mail: Bill Janssen .