CAS Registry Number

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A CAS Registry Number (also referred to as CAS RN or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.

Excerpt from the Wikipedia article “CAS Registry Number”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Carbamatesalts, CC BY-SA 4.0, via Wikimedia Commons.