What is the meaning of ɢ?

a voiced uvular plosive.

[ɢ]-onset (prestopping / preocclusion / preplosion), [ɢ]-release, [ɢ]-coloring, or a weak, fleeting or epenthetic [ɢ].

partially-devoiced g sound (IPA [ɡ̊]).

Used in the digraph ⟨ɴɢ⟩ for the /ŋ/ sound.

Source: wiktionary.org