planchette ronflante

**Planchette ronflante** is a term used in music. It refers to a percussion instrument that produces a buzzing or humming sound. The instrument consists of a heart-shaped board supported by two castors and a pencil-point. When one or more persons rest their fingers lightly upon it, the planchette traces out letters and words, creating a unique sound. The term "planchette ronflante" is also known as "rhombe" or "thunder stick". It is worth noting that the term "planchette" itself refers to a small plank or board in French