Coded Notation
Set of alpha-numeric symbols that uniquely identifies an item and supports its discovery and use.
Examples include the alpha-numeric code "CCSS.MATH.CONTENT.HSA.CED.A.2" identifying a node in the U.S. Common Core State Standards on creating equations in algebra, or, the code "8021" in the U.S. Standard Industrial Classification (SIC) for identifying the occupational context for "Offices and Clinics of Dentists".