The alveolar and dental ejective stops are types of consonantal sounds, usually described as voiceless, that are pronounced with a glottalic egressive airstream.
A reversed apostrophe is sometimes used to represent light aspiration, as in Armenian linguistics ⟨p‘ t‘ k‘⟩; this usage is obsolete in the IPA.
In Zulu and Xhosa, whose ejection is variable between speakers, plain consonant letters are used: p t k ts tsh kr for /pʼ tʼ kʼ tsʼ tʃʼ kxʼ/.
In some conventions for Haida and Hadza, double letters are used: tt kk qq ttl tts for /tʼ kʼ qʼ tɬʼ tsʼ/ (Haida) and zz jj dl gg for /tsʼ tʃʼ cʎ̥˔ʼ kxʼ/ (Hadza).
Features of the alveolar ejective: Symbols to the right in a cell are voiced, to the left are voiceless.