The Chinese word **螺丝 (luósī)** for "screw" is a compound word formed through semantic combination, where the first character **螺 (luó)**, meaning "snail" or "spiral," visually describes the helical, coiled shape of a screw's thread, and the second character **丝 (sī)**, meaning "thread" or "filament," directly denotes the threaded component. Together, they create a precise and vivid term that literally translates to "spiral thread," perfectly capturing the object's essential physical characteristic and function.