http://www.hostingdotpro.com/faq/secondlevel.html :

What is a Second Level Resolving Name
RegistryPro offers second level names (e.g., acme.pro) to registrants who provide multiple professional services and meet two or more eligibility requirements. Examples of organizations that would qualify are engineering firms (providing both engineering and legal service). Rather than being restricted to having two or more third-level names with the associated second level professional designation (e.g., acme.eng.pro and acme.law.pro), eligible registrants can also register second-level domains (e.g., acme.pro) to use for their website, email, and other internet identify applications.

- Если у Вас речь об этом :)