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The character 庫 (kù) originated in ancient China and belongs to the Liushutong (六书通) system. It is composed of 广 (a building with an open front) and 車 (cart/vehicle), representing a 'storehouse for vehicles' or 'armory.' Originally referring to a warehouse for storing chariots and military equipment, its meaning expanded to include any storage facility or repository. The character exemplifies the semantic-phonetic compound (形声) principle, where 广 provides the meaning (building) while 車 offers phonetic and semantic clues. Arrived in Japan: The character 庫 arrived in Japan during the early cultural exchanges with China, likely between the 5th and 7th centuries CE. It was systematically introduced along with other Chinese characters through Buddhist texts, Confucian classics, and official documents during the Asuka and Nara periods, when Japan adopted Chinese writing and administrative systems.