The Quadrangularis Reversum is best described as which of the following?

The Quadrangularis Reversum is best described as a percussion instrument primarily because of its design and its purpose. It is a large, rectangular instrument made up of wooden bars laid out on a metal frame, resembling a xylophone or a marimba. The player uses mallets or sticks to strike the bars, producing various musical tones and rhythms. This makes it similar to other percussion instruments like drums or cymbals, as it relies on striking or hitting to produce sound.