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Memory Alpha

Yominum is an element, symbol Ym.

Spock input the correct molecular formula for yominum sulfide crystals during his memory test after undergoing the reblending of his katra with his body in 2286. (Star Trek IV: The Voyage Home)

Yominium [sic] is derived from "Nimoy" spelled backwards. (Star Trek Encyclopedia (4th ed., vol. 2, p. 509)
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