The Three-letter Element Symbols:

@article{hrstrm2016TheTE,
  title={The Three-letter Element Symbols:},
  author={Lars {\"O}hrstr{\"o}m and Norman E. Holden},
  journal={Chemistry International},
  year={2016},
  volume={38},
  pages={4 - 8}
}
Abstract When Lars Öhrström started paying real attention to chemistry, during his high school years in the early 1980s, the three-letter symbols then designating any element with atomic number higher than 103 seemed like a permanent fixture to the periodic table in the chemistry classroom. In the following years, he learned that they were only temporary placeholders for elements that fulfilled the criteria of “being discovered” but where, for unclear reasons, a name had not yet been agreed. 
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