zero-zero

adjective3

1. •
   Involving neither of two powers increasing their stockpile of nuclear weapons.
2. •
   Pertaining to weather conditions of zero ceiling and zero visibility (i.e., opaque cloud all the way down to ground level), or to aircraft operations in such conditions.

   • Category IIIc ILS would enable landings in true zero-zero conditions (where the pilots can see nothing, not even the surface of the runway they're on), but the problem of blind taxiing - a necessary capability in order to make use of ILS-IIIc - remains unsolved.
3. •
   Pertaining to the ejection of the occupant of an aircraft from a grounded stationary position (i.e. zero altitude and zero airspeed).

   • Test vehicles used during this extensive programme were a launching stand for the zero-zero ejections... — 1965