What is a label?

Question
What is a label?
Answer
A label is the term that the Trademark Clearinghouse (TMCH) uses to define which exact text string is covered by a validated trademark. It is the name of the trademark, converted into a domain-like representation. That means that characters that are invalid in a domain name (for example a space) are removed or converted.
As a trademark might be represented as different labels, depending on how the invalid characters are handled. The rules are the following:
the special characters & and @ may be omitted, replaced by a hyphen or spelled out in one of the languages for which the trademark is valid
special characters may be omitted or replaced by a hyphen
In all cases, the result should be a valid domain name, i.e. not starting or ending with a hyphen, not containing two or more consecutive hyphens and not being more than 63 characters in length.
As an example, assume the trademark “We & Openprovider” is registered in the Benelux Office for Intellectual Property. The following labels may be registered:
weopenprovider (omitting &)
we-openprovider (replacing & by a hyphen)
we-and-openprovider (replacing & by the English 'and')
we-et-openprovider (replacing & by the French 'et')
and similar, replacing & by 'en', 'y' or 'und'
For more details and examples, please refer to section 3 of the TMCH Guidelines.