Nh is a digraph of the Latin alphabet, a combination of N and H. Together with lh and the interpunct, it is a typical feature of Occitan, a language illustrated by medieval troubadours.
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African languages
In some African languages, nh, such as Gogo, it's a voiceless /n̥/.
In the pre-1985 orthography of Guinea for its languages, nh represented a velar [ŋ], which is currently written ŋ.
Asian languages
In the Gwoyeu Romatzyh romanization of Mandarin Chinese, initial nh- indicates an even tone on a syllable beginning in [n], which is otherwise spelled n-.
Japanese
Early romanizations of Japanese, influenced by Portuguese orthography, sometimes used nh to represent a prepalatal. Today, this is usually written ny.
Vietnamese
In Vietnamese, nh represents a palatal [ɲ] word-initially. It was formerly considered a distinct letter, but is no longer. When this digraph occurs word-finally, its phonetic value varies between dialects:
The Vietnamese alphabet inherited this digraph from the Portuguese orthography.
Australian languages
In the transcription of Australian Aboriginal languages, nh represents a dental [n̪]. Due to allophony, it may also represent a palatal [ɲ].
American languages
In Purépecha, it's a velar nasal, [ŋ].
Occitan
In Occitan, nh represents a palatal [ɲ].
For n·h, see Interpunct#Occitan.
Portuguese
In Portuguese, nh represents a palatal [ɲ]. Due to allophony, it may represent the nasal approximant [ȷ̃] in most Brazilian, Santomean and Angolan dialects. It is not considered a distinct letter. Portuguese borrowed this digraph from Occitan.
Galician
In Galician, there are two diverging norms which give nh differing values.
In both norms, nh is not considered a distinct letter.
Welsh
In Welsh, nh is a voiceless alveolar nasal, /n̥/.