邹衍 Traditional form: 鄒衍 Pinyin (reading): Zōu Yǎn Definitions: Zou Yan (305-240 BC), founder of the School of Yin-Yang of the Warring States Period (475-221 BC) Characters: 邹 - an ancient state; surname 衍 - to overflow; to spread out Traditional characters: 鄒 - an ancient state; surname 衍 - to overflow; to spread out