Consonantal sound
The dental nasal click is a click consonant found primarily among the languages of southern Africa. 
The symbol in the International Phonetic Alphabet for a nasal dental click with a velar rear articulation is ⟨⟩ or ⟨⟩, commonly abbreviated to ⟨⟩, ⟨⟩ or ⟨⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨⟩ or ⟨⟩, abbreviated ⟨⟩, ⟨⟩ or ⟨⟩. For a click with a uvular rear articulation, the equivalents are ⟨⟩ and ⟨⟩.
Sometimes the accompanying letter comes after the click letter, e.g. ⟨⟩ or ⟨⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
Features.
Features of the dental nasal click:
Occurrence.
Dental nasal clicks are found primarily in the various Khoisan language families of southern Africa and in some neighboring Bantu languages, such as Yeyi and Fwe. 
Glottalized dental nasal click.
All Khoisan languages, and a few Bantu languages, have glottalized nasal clicks. These are formed by closing the glottis so that the click is pronounced in silence; however, any preceding vowel will be nasalized. 
References.
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