LiSp with a parallel data Structure, the ' xapping' , an array of valueS aSSigned to an array of SiteS. [G.L. Steele et al, "Connection Machine LISP: Fine-Grained Parallel Symbolic ProceSSing", in Proc 1986 ACM Conf on LISP and Functional Prog, Aug 1986, pp.279-297]. ["Connection Machine LISP Reference Manual", Thinking MachineS Corp, Feb 1987]. (1995-02-28)