This read-write two-character string sets the country-name field that will populate the subject information of a new self-signed HTTPS certificate the device generates. An administrator sets this to the correct ISO country code before regenerating a certificate, so the resulting certificate's subject details are accurate for internal PKI or compliance records. For example, setting this OID to the organization's country code before regenerating the device's certificate ensures the new certificate's country field correctly reflects the organization's location.