Nasal palatal approximant

The nasal palatal approximant is a type of consonantal sound used in some oral languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨j̃⟩, that is, a j with a tilde. The equivalent X-SAMPA symbol is j~, and in the Americanist phonetic notation it is ⟨ỹ⟩.

The nasal palatal approximant is sometimes called a nasal yod; [j̃] and [w̃] may be called nasal glides.

Features

Features of the nasal palatal approximant:

Its manner of articulation is approximant, which means it is produced by narrowing the vocal tract at the place of articulation, but not enough to produce a turbulent airstream.
Its place of articulation is palatal, which means it is articulated with the middle or back part of the tongue raised to the hard palate.
Its phonation is voiced, which means the vocal cords vibrate during the articulation.
It is a nasal consonant, which means air is allowed to escape through the nose, in this case in addition to through the mouth.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
Its airstream mechanism is pulmonic, which means it is articulated by pushing air solely with the intercostal muscles and abdominal muscles, as in most sounds.

Occurrence

[j̃], written ⟨ny⟩, is a common realization of /j/ before nasal vowels in many languages of West Africa that do not have a phonemic distinction between voiced nasal and oral stops, such as Yoruba, Ewe and Bini languages.