Personal identifier

Personal Identifiers (PID) are a subset of personally identifiable information (PII) data elements, which identify a unique individual and can permit another person to “assume” that individual’s identity without their knowledge or consent.

This can occur when PID data elements are used in any of these ways:

These examples are provided only as guidance. Other PIDs may be used in your location, and they may vary by country or region.

Treated as PID globally, not just for citizens of the EU

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Wikipedia