Yeyi may have up to four click types, dental ǀ, alveolar ǃ, palatal ǂ, and lateral ǁ.
However, the actual number of clicks is disputed, as researchers disagree on how many series of manner and phonation the language contrasts.
Fulop et al. (2002) studied the clicks of a limited vocabulary sample with 13 Yeyi speakers who were not from the core speaking area.
The series they found are: There are in addition prenasalized clicks such as /ŋᶢǂ/ and /ᵑǂˀ/, but Fulop et al. analyze these as consonant clusters, not single sounds.
[6] Miller (2011), in a comparative study with other languages, interprets their results as follows,[7] The contrast between ejective and glottalized nasal clicks is unusual, but also occurs in Gǀwi.
There are three basic series, tenuis, aspirated, and voiced, any of which may be prenasalized: A Yeyi Talking Dictionary was produced by Living Tongues Institute for Endangered Languages.