d
Defined-By: systemd
Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
Documentation: man:systemd-tpm2-clear.service(8)

A request to clear the TPM security chip has been issued to the firmware. This
is typically done as part of a comprehensive factory reset operation, and
ensures that on the next boot process the firmware will reset the TPM, after
interactively requesting confirmation by the user.

Clearing the TPM has the effect of invalidating all keys locked to the TPM,
including full disk encryption keys. Because of that care should be taken that
access to relevant resources is retained via other means.