Source : Free On-Line Dictionary of Computing

Iconicode
     
        1990-1992.  Visual dataflow language, token-based with
        hierarchical, recursive and iterative constructs.  Version:
        IDF with extensions for image processing.
     
        ["IDF: A Graphical Data Flow Programming Language for Image
        Processing and Computer Vision", Neil Hunt, Proc IEEE Conf on
        Systems Man & Cybernetics, IEEE, Nov 1990.  Available from
        Iconicon ].