(Vāk): “Speech” or the Eternal Word. In Hindu metaphysics, it has four levels, going from extremely subtle to gross sound. The four levels of vak are:

  1. Para vak: “The supreme word,” the inaudible transcendental sound
  2. Pashyanti vak: “The one which is seen,” the subtle sound expressed in such refined waves that it can be seen, but not heard
  3. Madhyama vak: “The one in the middle between the subtle and gross manifested sounds”
  4. Vaikhari vak: Physical sound

These levels of the Word correspond to the development of the entire Cosmos. Personified, Vak is the Goddess of divine speech, as mentioned in the Rig Veda.