Source : Free On-Line Dictionary of Computing

Interactive Data Language
     
        (IDL) A commercial {array}-oriented language with numerical
        analysis and display features, first released in 1977.  It
        supports interactive {reduction}, analysis, and
        {visualisation} of scientific data.  It is sold by {Research
        Systems, Inc.}
     
        Version: 3.6.1 runs under {Unix}, {MS-DOS}, {MS Windows},
        {VAX}/{VMS} and {Macintosh}.
     
        Not to be confused with any of the other {IDL}s.
     
        {(ftp://gateway.rs.inc.com/pub/idl)}.
     
        E-mail: .
     
        (1994-10-07)