sixty-fourth note 六十四分音符
sixty-fourth note[ noun ]
a musical note having the time value of a sixty-fourth of a whole note
<noun.communication>
Sixty-fourth \Six`ty-fourth"\, a.
Constituting or being one of sixty-four equal parts into
which a thing is divided.
{Sixty-fourth note} (Mus.), the sixty-fourth part of a whole
note; a hemi-demi-semiquaver.