The [k] sound is a very common sound cross-linguistically. Most languages have at least a plain [k], and some distinguish more than one variety. Most Indo-Aryan languages, such as Hindi and Bengali, have a two-way contrast between aspirated and plain [k]. Only a few languages lack a voiceless velar plosive, e.g. Tahitian and Mongolian.
Some languages have the voiceless pre-velar plosive,[1] which is articulated slightly more front compared with the place of articulation of the prototypical velar plosive, though not as front as the prototypical palatal plosive.
Conversely, some languages have the voiceless post-velar plosive,[2] which is articulated slightly behind the place of articulation of the prototypical velar plosive, though not as back as the prototypical uvular plosive.
Features
Features of the voiceless velar stop:
Its manner of articulation is occlusive, which means it is produced by obstructing airflow in the vocal tract. Since the consonant is also oral, with no nasal outlet, the airflow is blocked entirely, and the consonant is a plosive.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
It is an oral consonant, which means air is allowed to escape through the mouth only.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.
Less often voiced [ɡ]. It is usually transcribed in IPA as ⟨ɡ⟩, and it contrasts with aspirated form, which is usually transcribed ⟨k⟩.[14] See Luxembourgish phonology
^Instead of "pre-velar", it can be called "advanced velar", "fronted velar", "front-velar", "palato-velar", "post-palatal", "retracted palatal" or "backed palatal".
^Instead of "post-velar", it can be called "retracted velar", "backed velar", "pre-uvular", "advanced uvular" or "fronted uvular".
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