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砣 is a phono-semantic compound: 石 (shí, 'stone, rock') indicates the heavy stone material, while 它 (tā, normally 'it') provides the sound. Historically, it referred to a heavy stone weight, especially the sliding weight on a traditional Chinese steelyard balance scale for measuring goods and agricultural produce. Beyond the steelyard weight, it can denote a stone roller or grinding tool for polishing jade and other hard materials, linking the character to both measurement and material processing in traditional craftsmanship.
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