The written form (script) of Sanskrit is called Devanāgari (the Padma-Purāna Pātāla-khanda chapter 100 mentions it with the name Devalipi). Deva means demigod and lipi means ― script; thus Devalipi is the script used by the demigods. Devanāgari can similarly be translated: nagara means city, and nāgari means ― belonging to that city. So Devanāgari is the script belonging to the city of the demigods.
Akṣaraḥ:
Each letter (akṣaraḥ) represents one sound and one sound only, which makes it easy to resolve how to pronounce a particular Sanskrit letter. The word is split into two; a-not - kṣara-perish, melt away. There are different Sanskrit accents and dialects in different parts of India, but the original sounds are all pronounced the same.
The sound of Sanskrit mantras is based on four aspects:
1. Sthāna: the pronunciation position, where the letter
is uttered.
2. Prayatna: the endeavor in enunciation.
3. Kāla: the time period of the sound.
4. Karana: reflection, deflection, amplification,
attenuation, or echo of the sound.
Of the six vedāngas, the siksā vedānga describes the process of how sound is produced by the human body: the self (ātmā) initiates speech via the intelligence (buddhi), which inspires the mind (manah) to ignite the somatic blaze within (kāyāgni) that generates air (māruta) to be exhaled when it is oscillated (mandra) and vocalized in the mouth to emit sounds.