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.
The field of articulatory phonetics is a subfield of phonetics that studies articulation and ways that humans produce speech. Articulatory phoneticians explain how humans produce speech sounds via the interaction of different physiological structures. Generally, articulatory phonetics is concerned with the transformation of aerodynamic energy into acoustic energy. Aerodynamic energy refers to the airflow through the vocal tract. Its potential form is air pressure; its kinetic form is the actual dynamic airflow. Acoustic energy is variation in the air pressure that can be represented as sound waves, which are then perceived by the human auditory system as sound.
Nǁng or Nǁŋǃke, commonly known by the name of its dialect Nǀuu (Nǀhuki), is a moribund Tuu (Khoisan) language once spoken in South Africa. It is no longer spoken on a daily basis, as the speakers live in different villages. The ǀʼAuni name for the Nǀuu, ǂKhomani, is used by the South African government. As of June 2021, only one speaker of the Nǀuu dialect remains, the rest of the population having shifted to Khoekhoe and Afrikaans.
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.
The lateral clicks are a family of click consonants found only in African languages. The clicking sound used by equestrians to urge on their horses is a lateral click, although it is not a speech sound in that context. Lateral clicks are found throughout southern Africa, for example in Zulu, and in some languages in Tanzania and Namibia. The place of articulation is not known to be contrastive in any language, and typically varies from alveolar to palatal.
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.
In phonetics, a trill is a consonantal sound produced by vibrations between the active articulator and passive articulator. Standard Spanish ⟨rr⟩ as in perro, for example, is an alveolar trill.
Dahalo is an endangered Cushitic language spoken by around 500–600 Dahalo people on the coast of Kenya, near the mouth of the Tana River. Dahalo is unusual among the world's languages in using all four airstream mechanisms found in human language: clicks, implosives, ejectives, and pulmonic consonants.
Doubly articulated consonants are consonants with two simultaneous primary places of articulation of the same manner. They are a subset of co-articulated consonants. They are to be distinguished from co-articulated consonants with secondary articulation; that is, a second articulation not of the same manner. An example of a doubly articulated consonant is the voiceless labial–velar plosive, which is a and a pronounced simultaneously. On the other hand, the voiceless labialized velar plosive has only a single stop articulation, velar, with a simultaneous approximant-like rounding of the lips. In some dialects of Arabic, the voiceless velar fricative has a simultaneous uvular trill, but this is not considered double articulation either.
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.
The voiced dental click is a click consonant found primarily among the languages of southern Africa. The symbol in the International Phonetic Alphabet for a voiced dental click with a velar rear articulation is ⟨ɡ͡ǀ⟩ or ⟨ɡ͜ǀ⟩, commonly abbreviated to ⟨ɡǀ⟩, ⟨ᶢǀ⟩ or ⟨ǀ̬⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨ɡ͡ʇ⟩ or ⟨ɡ͜ʇ⟩, abbreviated ⟨ɡʇ⟩, ⟨ᶢʇ⟩ or ⟨ʇ̬⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɢ͡ǀ, ɢ͜ǀ, ɢǀ, 𐞒ǀ⟩ and ⟨ɢ͡ʇ, ɢ͜ʇ, ɢʇ, 𐞒ʇ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǀɡ⟩ or ⟨ǀᶢ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
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 ⟨ŋ͡ǀ⟩ or ⟨ŋ͜ǀ⟩, commonly abbreviated to ⟨ŋǀ⟩, ⟨ᵑǀ⟩ or ⟨ǀ̃⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨ŋ͡ʇ⟩ or ⟨ŋ͜ʇ⟩, abbreviated ⟨ŋʇ⟩, ⟨ᵑʇ⟩ or ⟨ʇ̃⟩. For a click with a uvular rear articulation, the equivalents are ⟨ɴ͡ǀ, ɴ͜ǀ, ɴǀ, ᶰǀ⟩ and ⟨ɴ͡ʇ, ɴ͜ʇ, ɴʇ, ᶰʇ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǀŋ⟩ or ⟨ǀᵑ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
The voiceless or more precisely tenuis dental click is a click consonant found primarily among the languages of southern Africa. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ǀ⟩. The symbol in the International Phonetic Alphabet for a tenuis dental click with a velar rear articulation is ⟨k͡ǀ⟩ or ⟨k͜ǀ⟩, commonly abbreviated to ⟨kǀ⟩, ⟨ᵏǀ⟩ or simply ⟨ǀ⟩; a symbol abandoned by the IPA but still preferred by some linguists is ⟨k͡ʇ⟩ or ⟨k͜ʇ⟩, abbreviated ⟨kʇ⟩, ⟨ᵏʇ⟩ or just ⟨ʇ⟩. For a click with a uvular rear articulation, the equivalents are ⟨q͡ǀ, q͜ǀ, qǀ, 𐞥ǀ⟩ and ⟨q͡ʇ, q͜ʇ, qʇ, 𐞥ʇ⟩. Sometimes the accompanying letter comes after the click letter, e.g. ⟨ǀk⟩ or ⟨ǀᵏ⟩; this may be a simple orthographic choice, or it may imply a difference in the relative timing of the releases.
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 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.
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⟩.
A velar click, or more precisely a back-released velar click or back-released uvular click, is a click consonant found in paralinguistic use in languages across Africa, such as Wolof. The tongue is in a similar position to other click articulations, such as an alveolar click, and like other clicks, the airstream mechanism is lingual. However, unlike other clicks, the salient sound is produced by releasing the rear closure of the tongue rather than the front closure. Consequently, the air that fills the vacuum comes from behind the tongue, from the nasal cavity and the throat. Velar clicks are always voiceless and typically nasal, as nasal airflow is required for a reasonably loud production.
