Zone of Separation (ZOS)

area of separation (=buffer zone)

buffer zone / area of separation

separation zone

grid zone / grid-zone

zone standard time (zone time) (ZST)

killing zone / kill zone

grid zone designation / Grid Zone Designator

grey-zone / grey zone (international relations)

hundred-per-cent zone (one-hundred-per-cent zone)

no-fire zone / no fire zone

flight restriction zone / flight restricted zone (FRZ)

altitude separation

flight separation

forcible separation

separation losses

separation of belligerents

separation of forces

line of separation

military authority assumes responsibility for separation of aircraft (MARSA)

unwanted separation sensing strap

flow with preserved pattern of separation

surface of separation

boundary layer separation

flow separation

lateral separation

longitudinal separation

separation point

vertical separation

non-radar separation

traffic separation

separation

separation allowance