Voiceless palatal fricative

The voiceless palatal fricative is a type of consonantal sound used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is ⟨ç⟩, and the equivalent X-SAMPA symbol is C. It is the non-sibilant equivalent of the voiceless alveolo-palatal sibilant.

The symbol ç is the letter c with a cedilla, as used to spell French and Portuguese words such as façade and ação. However, the sound represented by the letter ç in French, Portuguese and English orthography is not a voiceless palatal fricative but /s/, the voiceless alveolar fricative.

Palatal fricatives are relatively rare phonemes, and only 5% of the world's languages have /ç/ as a phoneme. The sound occurs, however, as an allophone of /x/ in German, or, in other languages, of /h/ in the vicinity of front vowels.

There is also the voiceless post-palatal fricative in some languages, which is articulated slightly more back compared with the place of articulation of the prototypical voiceless palatal fricative, though not as back as the prototypical voiceless velar fricative. The International Phonetic Alphabet does not have a separate symbol for that sound, though it can be transcribed as ⟨ç̠⟩, ⟨ç˗⟩ (both symbols denote a retracted ⟨ç⟩) or ⟨x̟⟩ (advanced ⟨x⟩). The equivalent X-SAMPA symbols are C_- and x_+, respectively.

Especially in broad transcription, the voiceless post-palatal fricative may be transcribed as a palatalized voiceless velar fricative (⟨xʲ⟩ in the IPA, x' or x_j in X-SAMPA).