◌̃

Usage notes
Distinguish two stacked nasal tildes (strong nasalization, ) from a double tilde: ⟨◌͌⟩.

Etymology
Developed in cursive writing from n atop another letter.

Diacritical mark

 * — or
 * — or
 * — or
 * — or
 * — or

Usage notes

 * In the letter, forms with the sound  followed by a semivowel or word-finally, as in  and , or in words derived from those, as in.
 * In the letter, forms with the sound  followed by a semivowel, as in  and.
 * Additionally, the same diacritical mark has had other uses in the past:
 * In the letter, forms with the sound  followed by a vowel, as in.
 * Abbreviation of or  in the syllable coda, as in  (for ) and  (for ).
 * In the letter, forms as an abbreviation of  and derivatives, as in  for ,  for  and  for.
 * The tilde can appear in nonstressed or stressed vowels alike:
 * A tilde can occur in an unstressed syllable in the same word as the acute or circumflex accent, as in, and.
 * Multiple tildes can occur in augmentatives, as in and.
 * In words with the suffixes (forms diminutives) and  (forms adverbs from adjectives, like the English suffix ), the stressed syllable changes and thus normally accents would be dropped, as in, ; , . That does not happen with the tilde: , ; ,.

Usage notes
In some dialects of Vietnamese, particularly Saigonese, the mid-rising, glottalized tone is conflated with the mid falling-rising, harsh tone represented by ̉. Therefore, speakers of Saigonese often use ̉ in words that are spelled with a tilde in standard written Vietnamese.

In Vietnamese handwriting and signmaking, the letter I/i retains its tittle.

In Vietnamese handwriting, when the tilde is combined with the circumflex, the tilde's left side may be omitted and its right side curled.