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Yominum

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Yominum is apparently an element, symbol Ym. It is apparently radioactive, and presumably a heavy element.

Spock input the correct molecular formula for yominum sulfide crystals in his training computer after undergoing the reblending of his katra with his body. (Star Trek IV: The Voyage Home)

The element or its isotopes have not been mentioned before or since Star Trek IV. Yominium [sic] is derived from "Nimoy" spelled backwards. (Star Trek Encyclopedia)

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