Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Sound Devices (hierarchy name)
5. sound devices (equipment)
6. [sound devices by acoustical characteristics]
7. aerophones
8. flutes (aerophones)
9. duct flutes
10. whistles

Anotations

Scope note:

Metal whistles traditionally used on ships by boatswain's mates to relay orders or to pipe senior naval officers aboard; they were grasped in the hand when blown, the pitch rising or falling as the hand was opened or closed.