纛

纛 is a phono-semantic compound combining the semantic component 糸 (silk) and the phonetic component 毒 (poison). It denotes a large, elaborate banner or standard historically used in military campaigns and imperial processions, often made of heavy silk and adorned with feathers or yak tails. These banners served as crucial signaling devices and symbols of supreme command, so the character appears primarily in historical texts on warfare, military ranks, and imperial authority. Rare in modern Chinese, it is now confined almost entirely to classical literature and historical studies.