One of many inventions created by the Kryptonian surgeon Dahr-Nel. It appears to be a type of battery or power source used by Dahr-Nel, and later Superman, to operate the Plastimold, another of Dahr-Nel's inventions (SGLL No. 90, Feb 1969: "Lois Lane's Future Husband"; SGLL No. 106, Nov 1970: "I am Curious (Black)!").