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The character 日 originated as a pictogram of the sun, depicted in oracle bone script as a circle with a dot or short line inside. Over centuries, it evolved through bronze script and seal script, stylizing into its modern square form with a horizontal stroke. Meaning 'sun' or 'day,' it symbolizes light, time, and celestial energy in Chinese culture, reflecting its foundational role in calendars and daily life. Arrived in Japan: The character 日 arrived in Japan around the 5th century CE, during the period when Chinese writing was introduced via Korea, and it became integral to the Japanese writing system as a kanji, used in words like 'nichi' (日, meaning 'sun' or 'day').