👉 The term "theremin" is a musical instrument that was invented in 1960 by the Italian physicist and inventor Giancarlo Fabbri. It is a type of electronic synthesizer known for its ability to produce harmonic tones, often used as a musical instrument in orchestras or as an accompaniment to other instruments. The term "theremin" has been around since the 1930s, when it was first introduced by Fabbri and his students.