Triad is a word to refer to a group of three elements. In philosophy and religion, triads, triangles, and trinities are prominent. H. P. Blavatsky said: "Everywhere antiquity slows an unbounded reverence for the Triad and Triangle--the first geometrical figure."
The first triad is formed by the Absolute and its two aspects, the Pre-cosmic Ideation and Substance:
Considering this metaphysical triad as the Root from which proceeds all manifestation, the great Breath assumes the character of precosmic Ideation. It is the fons et origo of force and of all individual consciousness, and supplies the guiding intelligence in the vast scheme of cosmic Evolution. On the other hand, precosmic root-substance (Mulaprakriti) is that aspect of the Absolute which underlies all the objective planes of Nature.
The human Triad (sometimes called "higher triad" or "upper triad") is formed by the three higher principles, Atma, Buddhi and Manas, the fruition of the latter assimilated by the first two after every terrestrial life. In other occasions, H. P. Blavatsky says that the triad corresponds to "Âtmâ-Buddhi and the “Envelope” which reflects their light, the three in one", the "envelope" referring to the auric egg. This is the perennial individuality that reincarnates in different personalities.
- Helena Petrovna Blavatsky, The Theosophical Glossary (Krotona, CA: Theosophical Publishing House, 1973), 333.
- Helena Petrovna Blavatsky, The Secret Doctrine vol. I, (Wheaton, IL: Theosophical Publishing House, 1993), 15.
- Helena Petrovna Blavatsky, The Secret Doctrine vol. I, (Wheaton, IL: Theosophical Publishing House, 1993), 237.
- Helena Petrovna Blavatsky, The Theosophical Glossary (Krotona, CA: Theosophical Publishing House, 1973), 338.
- Triad at Theosopedia