A Betazoid chime
The Betazoid chime was a small crystalline octagonal instrument that was struck with a little hammer.
On Betazed, it is customary to strike the chime during a meal to express gratitude for the food that is consumed. Homn struck the chime during a banquet aboard the USS Enterprise-D celebrating the upcoming marriage between Deanna Troi and Wyatt Miller in 2364, (TNG: "Haven") and again the next year, when Captain Jean-Luc Picard was having a private dinner with Lwaxana Troi. (TNG: "Manhunt")