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neodymium from the greek "neos", meaning new, and "didymos", meaning twin. rare-earth magnets , lasers , violet colors in glass and ceramics, didymium glass, ceramic capacitors , electric motors of electric automobiles pm promethium after the titan prometheus , who brought fire to mortals. nuclear batteries
such as galfenol , steel additive tb terbium after the village of ytterby , sweden . additive in neodymium based magnets , green phosphors , lasers , fluorescent lamps (as part of the white triband phosphor coating), magnetostrictive alloys such as terfenol-d , naval sonar systems, stabilizer of fuel cells...
https://en.wikipedia.org/wiki/Rare-earth