from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A diacritic used in the Devanagari script as a nasal consonant.
From Sanskrit अनुस्वार (anusvāra). (Wiktionary)
A is the first letter of the Sanskrit alphabet; U is a vowel and in the middle, and the last letter is a special letter called anusvara, which is the “ung” sound.