Altissimo refers to a technique used primarily in woodwind instruments, particularly the saxophone and clarinet, to produce very high notes beyond the standard range. This technique involves specific fingerings and embouchure adjustments, allowing musicians to access these higher pitches, which can add expressiveness and complexity to their performances. The term "altissimo" is derived from the Italian word for "highest." Mastering this technique requires practice and control, as it can be challenging to produce clear and stable notes in this range. Many jazz and classical musicians incorporate altissimo to enhance their musical expression and showcase their technical skills.