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The character 藻 (zǎo) originally depicted aquatic plants or algae, combining the grass radical (艹) with elements suggesting water plants. In ancient Chinese character classification (Liushutong), it represented water vegetation. Over time, it evolved to mean not just literal algae but also literary ornamentation or elegant diction, as algae were seen as natural decorations in water. The modern kanji retains this dual meaning of both aquatic plants and ornate language. Arrived in Japan: The character 藻 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing system (kanji) through Buddhist texts and cultural exchange with China and Korea. It appears in early Japanese literary works like the Man'yōshū (8th century), indicating it was well-established in Japanese writing by the Nara period.