Which term refers to a very soft dynamic in music?

The term that refers to a very soft dynamic in music is "pianissimo." In musical notation, pianissimo is indicated by the abbreviation "pp" and signifies that the performer should play very softly. This dynamic level is softer than "piano" (which means soft) and is used to create a gentle, delicate sound, often to convey subtle emotional nuances in the music.

In contrast, mezzo piano indicates a moderately soft dynamic, while fortissimo refers to a very loud dynamic, and mezzo forte indicates a moderately loud dynamic. Each of these terms describes different levels of intensity in sound, with pianissimo being the softest among them. Understanding dynamics like pianissimo is essential for expressive musical performance, as they guide the player in conveying the intended mood and character of the piece.