The Twilight Zone | The Twilight Zone (1959 TV series) | East Coast Main Line | West Coast Main Line | New Line Cinema | Negative Zone | Cunard Line | White Star Line | Panama Canal Zone | Eastern Time Zone | The Onedin Line | Maginot Line | Twilight Zone | Great Central Main Line | What's My Line? | Walk the Line | Stena Line | Line 13, Shanghai Metro | Line 13 | A Chorus Line | What's My Line | V/Line | branch line | Wirral Line | Siegfried Line | Midland Main Line | Korean Demilitarized Zone | Gyeongbu Line | The Dead Zone (TV series) | The Dead Zone |
As such, it could be a sociological term, but was actually coined by Alan Rayner and Norman Todd working at Exeter University in the late 1970s, to characterise a particular kind of zone line formed between wood-rotting fungal mycelia.