In the beginning of creation, fourteen vowel sounds were created from the mouth of four-headed Brahmā (Brahma). Manu, the king of fourteen Manvantara(s) , was born out of these fourteen vowel sounds. The letter ‘Ai’ was the tenth of these fourteen vowel sounds created by Brahmā. The fourteen letters from ‘A’ to ‘Au’ were envisioned as epitomised deities in the Vāyu Purāṇa. The epitome of Ai letter was known to be yellow and ash-coloured.