A projection of the molecular structure of yominum sulfide.
Yominum sulfide is a chemical with a molecular formula of K4YM3(SO73ES2).
When Spock was performing a memory test, one of the questions asked him what the molecular formula for yominum sulfide was. (Star Trek IV: The Voyage Home)
- Yominium was named after Leonard Nimoy -- Yomin is Nimoy spelled backwards.