From BrahmaKumaris.Info Encyclopedia
Avyakt is Hindi (sanskrit) for "subtle" as in "not corporeal".
- Literally not manifest, not in the physical form or apparent, imperceptible. Hence ‘Avyakt murli’, for the teachings of Shiv Baba given through the medium of Dadi Gulzar, after Brahma's ascent to the angelic world in 1969. Also ‘Avyakt BapDada’ - the combined form of Shiva and Brahma in the angelic world.