Definition & Meaning of "sixty-fourth note"

What is a "sixty-fourth note"?

A sixty-fourth note is a musical symbol that represents a duration equal to one-sixty-fourth of the length of a whole note. It is shown as a filled circle with a stem and four flags. This note lasts for one-sixteenth of the time of a quarter note, making it one of the shortest note values commonly used. Sixty-fourth notes are used to create extremely fast and detailed rhythmic patterns in music, fitting a large number of notes into a single measure.