What is the meaning of ?

A letter for transliterating a voiced uvular plosive (IPA ɢ), e.g. for the Georgian-script letter and in Boas (1900) for Kwakiutl.

the voiceless closed laminal postalveolar fricative of Circassian languages (the "Circassian dental hiss"). The voiced homolog is .

Source: wiktionary.org