Solitary confinement

Solitary confinement was when a prisoner was incarcerated on their own.

Oswald Danes was in solitary confinement for six years. (TV: Rendition)

Harlan placed the Eighth Doctor in solitary confinement after a food fight. (AUDIO: The Conscript)

On Folly, Noreen Chaplin placed the Fifth Doctor in solitary confinement twice; first for twenty days, then for six months. (AUDIO: Doing Time)