Final answer:
The percussion sound associated with hollow organs like the stomach is known as tympany, a drum-like sound that indicates the presence of air within the organ.
Step-by-step explanation:
The percussion sound over hollow organs such as the stomach or gastric bubble is referred to as tympany. Tympany is a drum-like, hollow sound that you can hear when tapping over an air-filled organ. Other types of percussion sounds include dullness, resonance, and flatness, each indicating different underlying structures. For instance, dullness typically points to a dense organ like the liver, flatness is often heard over muscles, and resonance is associated with healthy lung tissue.