Praseodymium

Pr

Praseodymium's name is derived from the Greek 'prasios didymos' meaning green twin.

It's one of the two elements with "twin" in its etymology, the other being neodymium. For this reason, I gave each one of them half of the gemini symbol.

Unicode character for both of them together: ♊︎

Links: [1] [2]