The nasal palatal approximant is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet

International Phonetic Alphabet

The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...

  that represents this sound is ⟨ȷ̃⟩, that is, a j with a tilde

Tilde

The tilde is a grapheme with several uses. The name of the character comes from Portuguese and Spanish, from the Latin titulus meaning "title" or "superscription", though the term "tilde" has evolved and now has a different meaning in linguistics....

.
The equivalent X-SAMPA symbol is j~, and in the Americanist phonetic notation it is ⟨ỹ⟩.

In linguistics, the nasal palatal approximant is sometimes called a nasal yod. [ȷ̃] and [w̃] may be called nasal glide

Nasal glide

A nasal glide is a semivowel which is nasalized. It may be the*nasal palatal approximant or the*nasal labio-velar approximant In Bini, the nasalized allophones of the glides and are nasal stops, and ....

s. In some languages like Portuguese

Portuguese language

Portuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...

, they form a second element of nasal diphthongs.

Features

Features of the nasal palatal approximant:

Occurrence

[ȷ̃], written ny, is a common realization of /j/ before nasal vowels in many languages of West Africa which do not have phonemic nasal consonants, such as Ewe

Ewe language

Ewe is a Niger–Congo language spoken in Ghana, Togo and Benin by approximately six million people. Ewe is part of a cluster of related languages commonly called Gbe, spoken in southeastern Ghana, Togo, and parts of Benin. Other Gbe languages include Fon, Gen, Phla Phera, and Aja...

 and Bini.

Language		Word	IPA International Phonetic Alphabet The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...	Meaning	Notes
Hindi					Allophone of ɲ before j
Polish Polish language Polish is a language of the Lechitic subgroup of West Slavic languages, used throughout Poland and by Polish minorities in other countries...			[kɔȷ̃]	'horse'	Allophone of ɲ in coda position or before fricatives. See Polish phonology Polish phonology The phonological system of the Polish language is similar in many ways to those of other Slavic languages, although there are some characteristic features found in only a few other languages of the family, such as contrasting retroflex and palatal fricatives and affricates, and nasal vowels...
Portuguese Portuguese language Portuguese is a Romance language that arose in the medieval Kingdom of Galicia, nowadays Galicia and Northern Portugal. The southern part of the Kingdom of Galicia became independent as the County of Portugal in 1095...	Brazilian Brazilian Portuguese Brazilian Portuguese is a group of Portuguese dialects written and spoken by most of the 190 million inhabitants of Brazil and by a few million Brazilian emigrants, mainly in the United States, United Kingdom, Portugal, Canada, Japan and Paraguay....		[ˈsõȷ̃ʊ]	'dream'	Nasalizes the preceding vowel; See Portuguese phonology Portuguese phonology The phonology of Portuguese can vary considerably between dialects, in extreme cases leading to difficulties in intelligibility. This article focuses on the pronunciations that are generally regarded as standard...
	Standard		[kɐ̃ȷ̃s]	'dogs'	Second part of a nasal diphthong, in both Brazil and Portugal; See Portuguese phonology Portuguese phonology The phonology of Portuguese can vary considerably between dialects, in extreme cases leading to difficulties in intelligibility. This article focuses on the pronunciations that are generally regarded as standard...