CAS Registry Number
CAS Registry Numbers are unique numerical identifiers assigned by the Chemical Abstracts Service to every chemical described in the open scientific literature (currently including those described from at least 1957 through the present) and including elements, isotopes, organic and inorganic compounds, ions, organometallics, metals, nonstructurable materials (aka 'UVCB's- i.e., materials of Unknown, Variable Composition, or Biological origin). They are also referred to as CAS RNs, CAS Numbers, etc.
Read more about CAS Registry Number: Use, Format, Standardization of Complexity, Ownership, CAS Number Search Engine, Trivia
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—Henry David Thoreau (1817–1862)