. . "The glass harmonica, also known as the glass armonica, bowl organ, hydrocrystalophone, or simply the armonica or harmonica (derived from \u1F01\u03C1\u03BC\u03BF\u03BD\u03AF\u03B1, harmonia, the Greek word for harmony), is a type of musical instrument that uses a series of glass bowls or goblets graduated in size to produce musical tones by means of friction (instruments of this type are known as friction idiophones)."@en . . .