The voiceless alveolo-palatal sibilant fricative is a type of consonantal sound, used in some spoken languages.The symbol in the International Phonetic Alphabet that represents this sound is ɕ (“c”, plus the curl also found in its voiced counterpart ʑ ). It is the sibilant equivalent of the voiceless palatal fricative, and as such it can be transcribed in IPA with ç˖ .
Link: https://en.wikipedia.org/wiki/Voiceless_alveolo-palatal_fricative