Fohat (Tib.). A term used to represent the active (male) potency of the Sakti (female reproductive power) in nature. The essence of cosmic electricity. An occult Tibetan term for Daiviprakriti primordial light: and in the universe of manifestation the ever-present electrical energy and ceaseless destructive and formative power. Esoterically, it is the same, Fohat being the universal propelling Vital Force, at once the propeller and the resultant.
Source: H.P.Blavatsky - The Theosophical Glossary