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The character 双 (shuāng), meaning 'pair' or 'double,' evolved from the ancient pictograph of two birds held in one hand, symbolizing a couple or something in twos. Its earliest form depicted two '隹' (zhuī, short-tailed birds) side by side, which later simplified into the modern 双. This character reflects the concept of pairing and is used in words like 双胞胎 (twins) and 双方 (both sides). Arrived in Japan: The character 双 likely arrived in Japan during the early centuries CE, around the 5th to 6th centuries, when the Japanese writing system was heavily influenced by the introduction of Chinese characters via Korean peninsular and Chinese texts.