The Pleroma is the POWER OF GOD, the MANNA of the Bible and GEM Energy when you use the Water Bridge. [Judy Beebe]
One idea that characterises most Gnostic texts are their complex accounts of the unfolding of the various Divine emanations, the Aeons, the "Eternities" or "Worlds", which become the transcendental Pleroma or realm of Light. The Pleroma is distinguished from the lower or manifest creation, so the Gnostic Cosmology is based on the idea of a duality between the transcendent Spiritual Reality (which includes the manifest and unmanifest) Absolute) and the imperfect psychic and physical reality, the "Cosmos". The psycho-physical cosmos in fact is considered a lower or imperfect reflection or copy of the higher perfect order of the Pleroma.
The exact representations of the Pleroma differ according to different Gnostic sects, but if we take the Sethian and Valentinian schools there is the division into four grades of divine existence, as follows
the Supreme Principle; - Spirit, Abyss, Fore-Father etc |
Barbelo - (and associated Aeons) |
The Self-Begotten - Autogenes - (and associated Aeons) |
the Archetypal Man - (and associated Aeons) |
the Cosmos - psyche and matter |
http://www.kheper.net/topics/Gnosticism/Pleroma.html
Valentinus
Diagram IV – Diagram of the Pleroma according to Valentinus
First, the (Point), the Monad, Bythus (the Hidden One), the unknown and unknowable Father. Then, the Δ (Triangle), the first pair or emanated Dyad — Nous (Mind) and his Syzygy Aletheia (Truth). Next, the □ (Square), the dual Dyad, Tetractys or Quaternity, two males: the Logos (Word) and Anthropos (Man), two females, their syzygies — Zoë (Life) and Ecclesia (the Church or Assembly), making a total of seven. The Triangle represents the Potential of Matter, the Vertical Straight Line represents the Power of the Spirit, and the Horizontal Line — the Potential of Matter.
Then we have the Pentad, Five Powers, mysteriously associated with the Manasaputras or Sons of Wisdom, who together with their corresponding syzygies form 10, or the Decad; finally, we have the Hexapla or Interlaced Triangles — the Heptad, which together with their respective syzygies make 12, the Dodecad.
Such is the composition of the Pleroma or Fullness, all 12 Aeons located within the circle, emanating from Bythus and the Primordial Source. The Pleroma consists of 12 Spheres or Aeons. In the center of the circle are 12 rays emanating from the center; the 12 Rays symbolize the 12 Aeons, and the 72 refer to the 72 Names of God derived from the Tetragrammaton.
Diagram of Pleroma as depicted in Vicente Beltrán Anglada‘s Esoteric Conversations

See Also
Aeons
Apocryphon of John
Epinoia
List of Synonyms for Scalar
Pleroma
Power of God
Pronoia
Scalar
Thought
Will