Source : WordNet®

no man's land
     n 1: an unoccupied area between the front lines of opposing
          armies
     2: land that is unowned and uninhabited (and usually
        undesirable)
     3: the ambiguous region between two categories or states or
        conditions (usually containing some features of both);
        "but there is still a twilight zone, the tantalizing
        occurrences that are probably noise noise but might
        possibly be a signal"; "in the twilight zone between humor
        and vulgarity"; "in that no man's land between negotiation
        and aggression" [syn: {twilight zone}]