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The character 纮 is a phono-semantic compound originally meaning the silk cord used to tie a hat under the chin. It combines the semantic radical 纟 (silk, thread) with the phonetic component 厷 for pronunciation. The traditional form, 紘, uses the unsimplified silk radical 糸 alongside the same phonetic element. Over time, its meaning expanded metaphorically from a literal hat-string to abstract concepts of vastness and boundlessness, reflecting a conceptual leap from a physical cord to spatial infinity.