label

One part of a domain name (glossary)domain name A readable internet name made of labels separated by dots. Full definition of domain name, the text between two dots. In www.example.com the labels are www, example and com. A label can be up to 63 characters long. Rules about allowed characters, reserved names (glossary)reserved name A name a registry withholds from normal registration, by rule or by its own choice. Full definition of reserved name and IDNs (glossary)IDN Internationalized Domain Name A domain name written in local scripts or with accented letters. Full definition of IDN are all written in terms of labels.