The yueqin is often used in Beijing-opera accompaniment.
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memory
Per 《新华词典》: 因音箱圆如满月而得名 — 'named for its soundbox being round like the full moon'. A short-necked relative of the ruan, central to the 'three pieces' (三大件) of Beijing-opera accompaniment: jinghu, yueqin and sanxian.