Although mu (무) is also a generic term for radishes in Korean, the word is usually used in its narrow sense, referring to the white radish.

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The Japanese and Korean term mu (Japanese: 無; Korean: 무) or Chinese wu (traditional Chinese: 無; simplified Chinese: 无), meaning "not have; without", is a key word in Buddhism, especially Zen traditions.

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A monk asked Zhaozhou Congshen, a Chinese Zen master (known as Jōshū in Japanese), "Has a dog Buddha-nature or not?" Zhaozhou answered, "Wú" (in Japanese, Mu)[11]