Limbus

n.
  1. (Scholastic Theol.) An spiritual region where certain classes of souls were supposed to await the last judgment.
  2. Hence: Any real or imaginary place of restraint or confinement; a prison; as, to put a man in limbo.
  3. (Anat.) A border or margin; as, the limbus of the cornea.

The limbus patrum was considered as a place for the souls of good men who lived before the coming of our Savior. The limbus infantium was said to be a similar place for the souls of unbaptized infants. To these was added, in the popular belief, the limbus fatuorum, or fool's paradise, regarded as a receptacle of all vanity and nonsense.