dead zone

An area with no life.

(ecology) An area of the ocean where oxygen levels are too low to support life, especially as a result of pollution.

(telecommunications) A region where mobile phones do not operate because there is no base station or repeater nearby.

(sports, gridiron football) Part of the field, entered by a player when they are on their opponent's side of the field but kicking a field goal would probably be unsuccessful and punting the ball would not dramatically change field position.

(military, historical) Area near a fortification that is relatively sheltered from defending fire, because direct fire from other parts of the walls cannot be directed around a curved wall.

(video games) A region within the player's viewpoint that is less sensitive to small movements, aiding accurate firing of weapons etc.