no_man's_land
1. [ noun ] (military,geography) an unoccupied area between the front lines of opposing armies
Synonyms: no-man's-land
Related terms: area
2. [ noun ] land that is unowned and uninhabited (and usually undesirable)
Related terms: land
3. [ noun ] the ambiguous region between two categories or states or conditions (usually containing some features of both)
Synonyms: twilight_zone
Examples:

"but there is still a twilight zone, the tantalizing occurrences that are probably noise noise but might possibly be a signal" "in the twilig

Related terms: ambiguity
Similar spelling:   no-man's-land