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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   YLISP
      A variant of Xlisp from Hewlett-Packard for the HP-95LX
      palmtop.
      (ftp://hpcsos.col.hp.com/mirrors/.scsi5/hp95lx/languages).
      (1994-11-23)