It can be anything! An apex, subdomain, or even a URL.

Results for*.selfvr.com

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2019-10-27T13:24:16.75	2019-10-25T00:00:00	2020-10-25T12:00:00	selfvr.com	*.selfvr.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-10-27T13:24:16.75	2019-10-25T00:00:00	2020-10-25T12:00:00	selfvr.com	*.selfvr.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-10-25T19:33:34.503	2019-10-25T00:00:00	2020-10-25T12:00:00	selfvr.com	*.selfvr.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2019-10-25T19:33:34.503	2019-10-25T00:00:00	2020-10-25T12:00:00	selfvr.com	*.selfvr.com	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1