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The character 測 (measure) evolved from ancient forms depicting water (氵) and rules/standards (則). In Liushutong L38499, we see early variations where the water radical combines with 則, which itself represents carving rules on bronze vessels. The character's core meaning of 'to measure depth' or 'to survey' comes from the practical application of using water levels or marked rules to gauge depth. Over time, 測 expanded to include meanings of estimation, conjecture, and mysterious depth, reflecting how measuring the unknown requires both precision and intuition. Arrived in Japan: The character 測 likely arrived in Japan during the 5th-6th centuries CE along with the broader introduction of Chinese writing systems, possibly through Buddhist texts and official missions to the Tang court. It appears in early Japanese documents like the Manyoshu (8th century) and was incorporated into the Japanese writing system as a standard kanji, retaining its core meaning of measurement and estimation.