Source : Free On-Line Dictionary of Computing

IF1
     
         A graph language used as an intermediate language
        for {dataflow} hardware.  Used by the {OSC} {SISAL} compiler.
     
        ["The Manchester Prototype Dataflow Computer", J.R. Gurd et
        al, CACM 28(1):34-52, Jan 1985].
     
        (1996-01-05)