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Open the tool →大衍之数 (dà yǎn zhī shù) is a Chinese idiom (chengyu) meaning “the number fifty”.
大衍之数 is pronounced dà yǎn zhī shù in Mandarin Chinese.
Literally, 大衍之数 means “the number of great expansion; The great divination number”. It is used to mean “the number fifty”.
大:大数;衍:演;大衍:指运用大数来演卦。指五十