A harp glissando is a musical technique performed on the harp in which the player sweeps their fingers or a hand across the strings of the harp in a rapid and continuous motion. This creates a smooth and cascading sound that moves from one pitch to another, producing a gliding or sliding effect. Harp glissandos are often used to add a sense of fluidity, elegance, and ethereal beauty to music. The specific notes and duration of the glissando can vary depending on the musical context and the desired effect by the composer or performer.