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

Results for*.roof.vc

Logged At	Not Before	Not After	Common Name	Matching Identities	Issuer Name
2020-09-17T09:14:17.81	2020-09-11T00:00:00	2021-09-12T12:00:00	roof.vc	*.roof.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-09-17T09:14:17.81	2020-09-11T00:00:00	2021-09-12T12:00:00	roof.vc	*.roof.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-09-11T10:13:53.15	2020-09-11T00:00:00	2021-09-12T12:00:00	roof.vc	*.roof.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1
2020-09-11T10:13:53.15	2020-09-11T00:00:00	2021-09-12T12:00:00	roof.vc	*.roof.vc	C=US, O=DigiCert Inc, OU=www.digicert.com, CN=Encryption Everywhere DV TLS CA - G1