cone of confusion

noun3

1. •
   A region directly above a VOR navigation station where the aircraft's navigation receiver experiences signal ambiguity.
2. •
   An area near a magnetic pole where compass readings become unreliable due to the Earth's magnetic field lines converging vertically.
3. •
   A cone-shaped region originating midway between an organism's two ears, and radiating outwards, where a sound's location is indeterminate.