What is a note that is held on or continuously repeated at a high pitch called?

The term that refers to a note that is held on or continuously repeated at a high pitch is known as a "Drone Note." In music, a drone note serves as a sustained pitch, which provides a harmonic foundation or background over which melodies can be played or sung. It is commonly found in various musical styles, especially in folk and classical music from different cultures, adding depth and texture to the piece.

By contrast, an inverted pedal typically refers to a sustained note (often the tonic) that appears in a different register than where it originally occurs, which does not specifically denote a high pitch. A pedal point generally involves a sustained note, but it can be at various pitches and is not defined by its continuity at a high pitch. Lastly, a suspended note is one that creates a temporary tension typically resolved into a consonant harmony, rather than being continuously held at a high pitch.