A country code second-level ___domain (ccSLD) is a second-level ___domain to a country code top-level ___domain. It may be set apart by the ___domain name registry for the registration of third-level domains or registered to a third party as a subdomain.
Many registries reuse common top-level ___domain names at the second-level such as "com", "net" and "org", e.g. .com.sg.