Source : Free On-Line Dictionary of Computing

FIDIL
     
        Based on "maps", generalised arrays whose index sets
        ("domains") are arbitrary D-dimensional sets.  Domains are
        first-class objects and may be constructed by union,
        intersection, etc.
     
        ["Fidil: A Language for Scientific Programming",
        P.N. Hilfinger et al, TR UCRL-98057, LLNL Jan 1988].