Ytterbium is a rare-earth metal element with the symbol Yb.
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镱 has essentially no standalone use outside chemistry - it is a purpose-built element character, the metal radical 钅 plus 意 for the sound. It appears only as the name of the element ytterbium.
意 supplies the sound yì with no meaning contribution - a pure phonetic pick for naming the element, the standard way modern element characters are coined.
