What is the meaning of ɕ?

a voiceless alveolo-palatal sibilant

[ɕ]-fricated release of a plosive (e.g. [tᶝ], sometimes implying an affricate [t͡ɕ]); [ɕ]-coloring; or a weak, fleeting or epenthetic [ɕ].

the IPA affricate [t͡ɕ]

Source: wiktionary.org