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===CAS Number (Chemical Abstracts Service Number)===
The CAS Number (Chemical Abstracts Service Registry Number) is a unique numerical identifier assigned to chemical substances globally, managed by the American Chemical Society (ACS).

* '''Format:''' Three-part structure XXXXXX-XX-X (e.g., 7440-02-0 for nickel).
* '''Purpose:''' Used worldwide as a chemical registry identifier in research, industry, and regulatory databases.
* '''Scope:''' More extensive than EC numbers, covering all chemical compounds, including commercial formulations, polymers, and biochemical compounds.
* '''Managed by:''' CAS Division of the American Chemical Society (ACS).
* '''Example:''' Nickel (Ni) → CAS Number: 7440-02-0.

[[Category: Taxonomy]]