Alright, let me just add few more words. The Kaankal Malini Tantra describes the Varna-Samuha. According to it varna from अ to अः are of SatvaGuna. From क to थ are RajoGuna and remaining of TamoGuna. It says:
आदावसौ जायते च शब्दब्रह्म सनातन: ।
वसुजिह्वा कालरात्र्या रूद्रडाकिन्यलंकृता ।
विषबीजं श्रृतिमुखं घ्रुवं हालाहल प्रिये ॥ॐ॥१८॥
Om is made of three ...
Mandukya Upanishad says that OM is a Combination of (A + U + M)
That same Self, from the point of view of the syllable, is Om, and
viewed from the stand point of the letters, the quarters are the
letters, and the letters are the quarters. The letters are A, U and
M.(Mandukya Up 8)
Vaisvanara seated in the waking state is the first letter A, owing to its all-...
The components of Om is explained very well in Shiva Puran.
"The syllable “A” came first from northern face; the syllable “U” from the western; the syllable “M” from the southern and the Bindu (dot) from the eastern face. The Nāda (mystical sound) came from the middle face. Thus the complete set cropped up in five-fold form. Then all of them united in ...
The Omkāra is made up of 3 letters: (1) akāra - अ; (2) ukāra - उ; (3) makāra - म and also an anusvāra (ardhamātrā).
It is often a misconception that it has only the first three letters but the Upanishads are clear that it has even an anusvāra. So you will pronounce it as Om and let the ma resonate after for a bit in the mouth/ nose area.
The Nādabindūpaniṣad ...