The euphonium is a conical-bore, tenor-voiced brass instrument. It derives its name from the Greek word euphonos, meaning "beautiful-sounding" or "sweet-voiced" (eu means "well" or "good" and phonium means "voice"). The euphonium is a valved instrument; nearly all current models are piston valved, though rotary valved models do exist. A person who plays euphonium is sometimes called a euphophonist, euphoniumist or a euphonist, while British players often colloquially refer to themselves as euphists. Similarly, the instrument itself is sometimes referred to as eupho or euph.