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A specialized formatted number that is registered with an internationally recognized standards organization. The unique alphanumeric/numeric identifier registered under the ISO registration standard to reference a specific object or object class. In the federal government PKI they are used to uniquely identify each of the four policies and cryptographic algorithms supported.
NIST SP 800-32
A globally unique identifier of a data object as defined in ISO/IEC 8824-2.
NIST SP 800-73-4 under Object Identifier
A value (distinguishable from all other such values) that is associated with an information object.
NISTIR 5308 under object identifier