Source : Free On-Line Dictionary of Computing

frobnitz
     
        /frob'nits/, plural "frobnitzem" /frob'nit-zm/ or "frobni"
        /frob'ni:/ (TMRC) An unspecified physical object, a widget.
        Also refers to electronic {black boxes}.  This rare form is
        usually abbreviated to "frotz", or more commonly to {frob}.
        Also used are "frobnule" (/frob'n[y]ool/) and "frobule"
        (/frob'yool/).  Starting perhaps in 1979, "frobozz" /fr*-boz'/
        (plural: "frobbotzim" /fr*-bot'zm/) has also become very
        popular, largely through its exposure as a name via {Zork}.
        These variants can also be applied to nonphysical objects,
        such as data structures.
     
        Pete Samson, compiler of the original {TMRC} lexicon, adds,q
        "Under the TMRC (railway) layout were many storage boxes,
        managed (in 1958) by David R. Sawyer.  Several had fanciful
        designations written on them, such as "Frobnitz Coil Oil".
        Perhaps DRS intended Frobnitz to be a proper name, but the
        name was quickly taken for the thing".  This was almost
        certainly the origin of the term.
     
        [{Jargon File}]
     
        (1994-12-16)