> Do you have a source for this? I've not heard this before. The Wikipedia article on FQDN doesn't mention it.
Actually it's right there in the Wikipedia article [1]...
The DNS root is unnamed, expressed as the empty label terminated by the dot. This is most notable in DNS zone files in which a fully qualified domain name must be specified with a trailing dot. For example, somehost.example.com. explicitly specifies an absolute domain name that ends with the empty top level domain label.
