Which term refers to a certificate that has been permanently invalidated?

The term that refers to a certificate that has been permanently invalidated is a revoked certificate. When a certificate is revoked, it means that the issuing authority has officially annulled or cancelled the certificate, rendering it void and no longer valid for use. This action typically occurs due to violations of regulations or standards set by the governing body.

In contrast, a suspended certificate indicates a temporary invalidation where the certificate might be reinstated after fulfilling specific conditions. A surrendered certificate implies that the individual voluntarily relinquished their rights or certification, often without any claims against it. An expired certificate simply means that the certificate has reached the end of its designated valid period, but it may potentially be renewed. Therefore, the concept of a revoked certificate distinctly signifies a permanent invalidation compared to these other terms.