A Bajoran girl with a gong
A gong was a musical percussion instrument.
The Ligonians on Ligon II placed two large gongs in their centerplace. (TNG: "Code of Honor")
The holographic recreation of the Temple of Akadar featured two large gongs. (TNG: "The Perfect Mate")
The two gongs seen were re-used from the first season episode "Code of Honor".
A gong was a common musical instrument for the Bajorans. (DS9: "Fascination", "The Begotten")