Soul

A soul was an ill-defined term for the essence of a sentient being.

The Ninth Doctor said that the Heart of the TARDIS was the soul of the Doctor's TARDIS.

Death, or Duroc, was attempting to collect thirteen souls in order to fully enter our reality. He was stopped by Owen Harper at twelve. (TV: Dead Man Walking)

Ms Kizlet was scavenging the Wi-Fi to upload the souls of people to feed to her client. (TV: The Bells of Saint John