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2121 is a tautonym (it is composed of two identical parts). View more tautonyms!


  1. 2121 is a Postal Code.
  2. 2121 is a Postal Code.
  3. 2121 is a Postal Code.
  4. 2121 a.k.a. is a Postal Code.


"2121" a.k.a. "The Demon Breed" is a book by James H. Schmitz.

  • also known as The Tuvela
  • genre: Speculative fiction
  • copyright: 1968-09


  1. 2121 a.k.a. Coal mining: The goal of coal mining is to obtain coal and sometimes other resources from the ground. Coal is valued for its energy content, and, since the 1880s, has been widely used to generate electricity. Steel and cement industries use coal as a fuel for extraction of iron from iron ore and for cement production. In the United States, United Kingdom, and South Africa, a coal mine and its structures are a colliery. In Australia, "colliery" generally refers to an underground coal mine.
  2. 2121 a.k.a. Rhizochloridales is an organism classification.
  3. 2121 a.k.a. Ellis van Creveld syndrome is a gene.
    • also known as Ellis van Creveld syndrome protein

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