Click consonants, or clicks, are speech sounds that occur as consonants in many languages of Southern Africa and in three languages of East Africa. Examples familiar to English-speakers are the tut-tut or tsk! tsk! used to express disapproval or pity, the tchick! used to spur on a horse, and the clip-clop! sound children make with their tongue to imitate a horse trotting. However, these paralinguistic sounds in English are not full click consonants, as they only involve the front of the tongue, without the release of the back of the tongue that is required for clicks to combine with vowels and form syllables.
A lateral is a consonant in which the airstream proceeds along one or both of the sides of the tongue, but it is blocked by the tongue from going through the middle of the mouth. An example of a lateral consonant is the English L, as in Larry. Lateral consonants contrast with central consonants, in which the airstream flows through the center of the mouth.
In phonetics, ejective consonants are usually voiceless consonants that are pronounced with a glottalic egressive airstream. In the phonology of a particular language, ejectives may contrast with aspirated, voiced and tenuis consonants. Some languages have glottalized sonorants with creaky voice that pattern with ejectives phonologically, and other languages have ejectives that pattern with implosives, which has led to phonologists positing a phonological class of glottalic consonants, which includes ejectives.
The bilabial clicks are a family of click consonants that sound like a smack of the lips. They are found as phonemes only in the small Tuu language family, in the ǂ’Amkoe language of Botswana, and in the extinct Damin ritual jargon of Australia. However, bilabial clicks are found paralinguistically for a kiss in various languages, including integrated into a greeting in the Hadza language of Tanzania, and as allophones of labial–velar stops in some West African languages, as of /mw/ in some of the languages neighboring Shona, such as Ndau and Tonga.
Dentalclicks are a family of click consonants found, as constituents of words, only in Africa and in the Damin ritual jargon of Australia.
The palatal or palato-alveolar clicks are a family of click consonants found, as components of words, only in southern Africa. The tongue is nearly flat, and is pulled back rather than down as in the postalveolar clicks, making a sharper sound than those consonants. The tongue makes an extremely broad contact across the roof of the mouth, making correlation with the places of articulation of non-clicks difficult, but Ladefoged & Traill (1984:18) find that the primary place of articulation is the palate, and say that "there is no doubt that should be described as a palatal sound".
The alveolar or postalveolar clicks are a family of click consonants found only in Africa and in the Damin ritual jargon of Australia. The tongue is more or less concave, and is pulled down rather than back as in the palatal clicks, making a hollower sound than those consonants.
In phonetics, the airstream mechanism is the method by which airflow is created in the vocal tract. Along with phonation and articulation, it is one of three main components of speech production. The airstream mechanism is mandatory for most sound production and constitutes the first part of this process, which is called initiation.
The retroflex clicks are a family of click consonants known only from the Central ǃKung language or dialect of Namibia. They are sub-apical retroflex and should not be confused with the more widespread postalveolar clicks, which are sometimes mistakenly called "retroflex" due to their concave tongue shape.
Yeyi is a Bantu language spoken by many of the approximately 50,000 Yeyi people along the Okavango River in Namibia and Botswana. Yeyi, influenced by Juu languages, is one of several Bantu languages along the Okavango with clicks. Indeed, it has the largest known inventory of clicks of any Bantu language, with dental, alveolar, palatal, and lateral articulations. Though most of its older speakers prefer Yeyi in normal conversation, it is being gradually phased out in Botswana by a popular move towards Tswana, with Yeyi only being learned by children in a few villages. Yeyi speakers in the Caprivi Strip of north-eastern Namibia, however, retain Yeyi in villages, but may also speak the regional lingua franca, Lozi.
Nasal clicks are click consonants pronounced with nasal airflow. All click types have nasal variants, and these are attested in four or five phonations: voiced, voiceless, aspirated, murmured, and—in the analysis of Miller (2011)—glottalized.
Pulmonic-contour clicks, also called sequential linguo-pulmonic consonants, are consonants that transition from a click to an ordinary pulmonic sound, or more precisely, have an audible delay between the front and rear release of the click. All click types have linguo-pulmonic variants, which occur as both stops and affricates, and are attested in four phonations: tenuis, voiced, aspirated, and murmured. At least a voiceless linguo-pulmonic affricate is attested from all Khoisan languages of southern Africa, as well as (reportedly) from the Bantu language Yeyi from the same area, but they are unattested elsewhere.
Ejective-contour clicks, also called sequential linguo-glottalic consonants, are consonants that transition from a click to an ejective sound, or more precisely, have an audible delay between the front and rear release of the click. All click types have linguo-glottalic variants, which occur as both stops and affricates, and may be voiced. At least a voiceless linguo-glottalic affricate is attested from all Khoisan languages of southern Africa, as well as from the Bantu language Yeyi from the same area, but they are unattested elsewhere.
The alveolar nasal click is a click consonant found primarily among the languages of southern Africa. The symbol in the International Phonetic Alphabet for a nasal alveolar click with a velar rear articulation is ⟨ŋ͡ǃ⟩ or ⟨ŋ͜ǃ⟩, commonly abbreviated to ⟨ŋǃ⟩, ⟨ᵑǃ⟩ or ⟨ǃ̃⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨ŋ͡ʗ⟩ or ⟨ŋ͜ʗ⟩, abbreviated ⟨ŋʗ⟩, ⟨ᵑʗ⟩ or ⟨ʗ̃⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɴ͡ǃ, ɴ͜ǃ, ɴǃ, ᶰǃ⟩ and ⟨ɴ͡ʗ, ɴ͜ʗ, ɴʗ, ᶰʗ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǃŋ⟩ or ⟨ǃᵑ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
The lateral nasal click is a click consonant found primarily among the languages of southern Africa. The symbol in the International Phonetic Alphabet for a nasal lateral click with a velar rear articulation is ⟨ŋ͡ǁ⟩ or ⟨ŋ͜ǁ⟩, commonly abbreviated to ⟨ŋǁ⟩, ⟨ᵑǁ⟩ or ⟨ǁ̃⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨ŋ͡ʖ⟩ or ⟨ŋ͜ʖ⟩, abbreviated ⟨ŋʖ⟩, ⟨ᵑʖ⟩ or ⟨ʖ̃⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɴ͡ǁ, ɴ͜ǁ, ɴǁ, ᶰǁ⟩ and ⟨ɴ͡ʖ, ɴ͜ʖ, ɴʖ, ᶰʖ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǁŋ⟩ or ⟨ǁᵑ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
The palatal nasal click is a click consonant found primarily among the languages of southern Africa. The symbol in the International Phonetic Alphabet for a nasal palatal click with a velar rear articulation is ⟨ŋ͡ǂ⟩ or ⟨ŋ͜ǂ⟩, commonly abbreviated to ⟨ŋǂ⟩, ⟨ᵑǂ⟩ or ⟨ǂ̃⟩. Linguists who prefer the old IPA letters use the analogous Beach convention of ⟨ŋ͡𝼋⟩ or ⟨ŋ͜𝼋⟩, abbreviated ⟨ŋ𝼋⟩, ⟨ᵑ𝼋⟩ or ⟨𝼋̃⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɴ͡ǂ, ɴ͜ǂ, ɴǂ, ᶰǂ⟩ and ⟨ɴ͡𝼋, ɴ͜𝼋, ɴ𝼋, ᶰ𝼋⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǂŋ⟩ or ⟨ǂᵑ⟩; this may be a simple orthographic choice, or may imply a difference in the relative timing of the releases.
The retroflex nasal click is a rare click consonant. In practical orthography, an ad hoc symbol ⟨‼⟩ is used for the retroflex clicks; a nasal click with a velar rear articulation is ⟨ŋ͡‼⟩ or ⟨ŋ͜‼⟩, commonly abbreviated to ⟨ŋ‼⟩, ⟨ᵑ‼⟩ or ⟨‼̃⟩. The implicit symbol in the International Phonetic Alphabet is ⟨ŋ͡𝼊⟩ or ⟨ŋ͜𝼊⟩, abbreviated ⟨ŋ𝼊⟩, ⟨ᵑ𝼊⟩ or ⟨𝼊̃⟩. Linguists who prefer the old IPA letters use the analogous Doke convention of ⟨ŋ͡ψ⟩ or ⟨ŋ͜ψ⟩, abbreviated ⟨ŋψ⟩, ⟨ᵑψ⟩ or ⟨ψ̃⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɴ͡‼, ɴ͜‼, ɴ‼, ᶰ‼⟩, ⟨ɴ͡𝼊, ɴ͜𝼊, ɴ𝼊, ᶰ𝼊⟩ and ⟨ɴ͡ψ, ɴ͜ψ, ɴψ, ᶰψ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨𝼊ŋ⟩ or ⟨𝼊ᵑ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
Various letters have been used to write the click consonants of southern Africa. The precursors of the current IPA letters, ⟨ǀ⟩ ⟨ǁ⟩ ⟨ǃ⟩ ⟨ǂ⟩, were created by Karl Richard Lepsius and used by Wilhelm Bleek and Lucy Lloyd, who added ⟨ʘ⟩. Also influential were Daniel Jones, who created the letters ⟨ʇ⟩ ⟨ʖ⟩ ⟨ʗ⟩ ⟨ʞ⟩ that were promoted by the IPA from 1921 to 1989, and were used by Clement Doke and Douglas Beach.
