Neodymium

Neodymium was an element, number 60 on the periodic table.

In 2373, Dr. Elias Giger offered to give Jake Sisko a mint-condition 1951 Willie Mays rookie baseball card he had won at an auction at Quark's in exchange for several items required to build his cellular regeneration and entertainment chamber. Among these items was a neodymium power cell. 

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Neodymium