Typically, mid-range vibrational aspects of Self comprised of many souls, much like a large limb of a tree with several smaller branches protruding. See Multi-dimensional Self. Also see Spiritual Lineage.
The spiritual body of the human vessel still remaining inside of Oneness and the vibration of Heaven. The OverSoul is the Higher Self or Intuitive Mind directing the soul in the human vessel on the evolutionary path home to God.