Its An Id
Many if not all artifacts, which have been valued enough to have been described and defined for Public disclosure, can receive this classification or category: ItsAnId
But
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The term Id, can mean many thing to many people, while meaning something very specific to others.
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In a database, the Key, is to be a UniqueId, in its Context of being in a Table.
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Some Ids bear the responsibility of defining or grouping of stuff into classes, as in AnimalVegetableMineral.
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The following have been used:
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User Id - to identify a personality usually with password to make unique as a user of a system or site
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Last four on front or three digits on the reverse of card as well as name, billing address, date of expiration and multiple digit number account number on a credit or debit card, used to verify a customer's identity
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Almost all Computing Artifacts bear a name specifying their identity
See
CategoryClassification