The term "chambered" refers to something that has one or more chambers, which are enclosed spaces or compartments. This can apply to various objects, such as a gun that has multiple chambers for holding ammunition, or a musical instrument like a trumpet that has chambers to enhance sound quality. In biology, "chambered" can describe structures within organisms, such as the heart of certain animals, which may have multiple chambers to separate oxygenated and deoxygenated blood. Additionally, some mollusks, like the nautilus, have chambered shells that provide buoyancy and protection.