What is the meaning of ć?

a voiceless alveopalatal affricate (IPA [t͜ɕ]).

The fifth letter of the Lower Sorbian alphabet, called ćej and written in the Latin script.

The fifth letter of the Polish alphabet, called cie and written in the Latin script.

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

The 5th letter of the Serbo-Croatian Latin alphabet (gajica), preceded by č and followed by d.

The fifth letter of the Silesian alphabet, written in the Latin script.

Additional letter in Slovene common mostly in loanwords from Serbo-Croatian.

The fifth letter of the Resian alphabet, written in the Latin script.

Phonetic transcription of sound [t͡ɕ].

The name of the Latin script letter Ć / ć.

The fifth letter of the Upper Sorbian alphabet, called ćet and written in the Latin script.

Source: wiktionary.org