The word "琴瑟" is formed by combining two independent characters, "琴" and "瑟", each representing a specific type of ancient Chinese stringed instrument. This is a semantic compound where both characters contribute their literal meanings, "琴" for a zither-like instrument and "瑟" for a larger multi-stringed instrument, to create a single term that refers to these instruments collectively. The formation relies solely on the direct association between the two related objects, without phonetic or grammatical markers, resulting in a binome that denotes the pair of instruments.