What is the meaning of ç?

a voiceless palatal fricative.

[ç]-fricated release of a plosive (e.g. [cᶜ̧] or [kᶜ̧]), sometimes implying an affricate (e.g. ⟨cᶜ̧⟩ for [c͡ç]); [ç]-coloring; or a weak, fleeting or epenthetic [ç].

The fourth letter of the Albanian alphabet, written in the Latin script.

The fourth letter of the Azerbaijani alphabet, called çe and written in the Latin script.

A letter of the Basque alphabet, called ze hautsi and written in the Latin script.

c cedilla (the ce trencada, the letter c with a cedilla, used to represent /s/ before a, o or u; it is not considered a separate letter)

"c cédille", the letter c with a cedilla

the voiceless palatal click consonant, and the base of multigraphs for the other palatal clicks; now replaced with ⟨ǂ⟩.

A letter of the Naro alphabet, written in the Latin script.

The fourth letter of the Rohingya alphabet, called çii and written in the Latin script.

A letter of the Yakut alphabet, written in the Latin script. Yañalif alphabet, 1929–1939.

"c cedilha" (the letter c with a cedilla)

Used to represent -ça.

c with cedilla

The fourth letter of the Turkish alphabet, called çe and written in the Latin script.

The third letter of the Turkmen alphabet, called çe and written in the Latin script.

Source: wiktionary.org