The word **插头** (chātóu), meaning "electrical plug," is a compound noun formed through semantic combination: the character **插** (chā) means "to insert" or "to plug in," describing the action, while **头** (tóu) means "head" or "end," referring to the physical object that performs the action. Together, they create a logical and descriptive term for the device—literally the "inserting end"—that connects an appliance to a power source, exemplifying how Chinese frequently builds vocabulary by combining meaningful morphemes to indicate both function and form.