The Huangdi Yinfujing (Chinese: 黃帝陰符經; pinyin: Huángdì Yǐnfújīng; Wade–Giles: Huang-ti Yin-fu Ching; literally "Yellow Emperor's Hidden Talisman Classic"), or Yinfujing, is a circa 8th century CE Daoist scripture associated with Chinese astrology and Neidan-style Internal alchemy. In addition, Huangdi Yinfujing is also the name of a Chinese Fengshui text on military strategy.
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