Vessel flute.

An aerophone in which the body of the pipe is globular- or vessel-shaped rather than tubular. The best-known example is the ocarina. Most vessel flutes have finger-holes; where they do, the action of opening them raises the pitch (irrespective of the order in which the holes are opened) but the change in pitch is related to the sizes of the apertures.

For a full discussion of vessel flutes, see Ocarina.