transverse flute (e.g. a fife)
end-blown flute (esp. the recorder)
横笛の音が聞こえてきた。
I heard the sound of a transverse flute.
横笛は横に構えて吹く。
The transverse flute is played sideways.
能の演奏には横笛が使われる。
Transverse flutes are used in Noh performances.