A voiceless bidental fricative is a rare consonantal sound found in one natural language, in the Shapsug dialect of Adyghe, where it appears as a variant of . People with hypoglossia (abnormally small tongue) may use it for target . It has been represented in the extIPA as , but since there is no frication at the velar place of articulation, it is thus better transcribed as and the extIPA chart uses the latter.
Features of a voiceless bidental fricative: