The most populous languages with clicks, Zulu and Xhosa, use the letters c, q, x, by themselves and in digraphs, to write click consonants. Most Khoisan languages, on the other hand (with the notable exceptions of Naro and Sandawe), use a more iconic system based on the pipe . (The exclamation point for the "retroflex" click was originally a pipe with a subscript dot, along the lines of ṭ, ḍ, ṇ used to transcribe the retroflex consonants of India.) There are also two main conventions for the second letter of the digraph as well: voicing may be written with g and uvular affrication with x, or voicing with d and affrication with g (a convention of Afrikaans). In two orthographies of Juǀʼhoan, for example, voiced is written g! or dq, and !x or qg. In languages without , such as Zulu, may be written gq.
the most populous languages with clicks zulu and xhosa use the letters c q x by themselves and in digraphs to write click consonants most khoisan languages on the other hand (with the notable exceptions of naro and sandawe) use a more iconic system based on the pipe  (the exclamation point for the "retroflex" click was originally a pipe with a subscript dot along the lines of ṭ ḍ ṇ used to transcribe the retroflex consonants of india) there are also two main conventions for the second letter of the digraph as well voicing may be written with g and uvular affrication with x or voicing with d and affrication with g (a convention of afrikaans) in two orthographies of juǀʼhoan for example voiced is written g or dq and x or qg in languages without  such as zulu may be written gq