In his book "God Talks with Arjuna", Paramahansa Yogananda says this:
God manifests in creation as the Cosmic Vibration, which expresses itself as Cosmic Sound and Cosmic Light. The Cosmic Sound or Aum is the synthesis of all the sounds of the highly vibrating life forces, electrons, protons, and atoms. By listening to Aum, the yogi becomes a true brahmachari or one who is attuned to Brahman. By deep concentration the devotee can hear Aum at any time and in any place....
In the Yoga Sutras of Patanjali, Aum (Om) is spoken of as the symbol of Ishvara or God. This great authority on yoga refers to Aum as a Cosmic Sound continuously flowing in the ether, unutterable by any human voice, and fully known only to the illuminated.
My question: Cosmic sound is referred to as AUM (OM) but what is cosmic light referred to as?