In string playing the rapid movement of wrist and finger creates a throbbing effect called?

The rapid movement of wrist and finger in string playing creates a throbbing effect called tremolo. Tremolo is a technique that involves a rapid alternation of two notes, usually on the same string, creating a vibrating or pulsating sound. It is commonly used in classical music to create a sense of excitement, intensity, or drama, and can be applied to both solo and orchestral performances. Tremolo requires precise coordination between the fingers and the wrist, and can be a challenging technique to master, but when executed well, it can produce a beautiful and expressive effect.