Source : Free On-Line Dictionary of Computing

Big bag of pages
     
        (BIBOP) Where data objects are tagged with some kind of
        descriptor (giving their size or type for example) memory can
        be saved by storing objects with the same descriptor in one
        "page" of memory.  The most significant bits of an object's
        address are used as the BIBOP page number.  This is looked up
        in a BIBOP table to find the descriptor for all objects in
        that page.
     
        This idea is similar to the "zones" used in some {Lisp}
        systems (e.g. {LeLisp}).
     
        [David R. Hanson.  "A portable storage management system for
        the Icon programming language".  Software - Practise and
        Experience, 10:489-500 1980].
     
        (1994-11-29)