The word 'twins' has two uses: 1: the third sign of the zodiac; the sun is in this sign from about May 21 to June 20; 2: (mineralogy) two interwoven crystals that are mirror images on each other
Rather surprising, it means the people or objects concerned are a set of twins that are identical.
It did once a terrorist attack happened
Identical twins are called monozygotic.
hmm I suppose you mean neodymium?