Left: thread 纟/糸, right: circumference 周 (A framed 冂 luck 吉, sets its circumference) [joy 吉 = simplif. of happy 喜, where the scholar 士 has beans 豆 in the mouth 口 and is happy]
Mnemonic
(Here "encircle" in the sense of put on clothes) The thread that encircles you is the silk.
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