This is the country-code top level domain from Sweden.
You can check Domain availability here.
The Terms and Conditions can be found here.
IDN is supported (Special characters like å, ä, ö, more info here).
Blocked and not-allowed domains here.
When this domain is registered or transferred to us, we will require a personal identification number. This number may vary depending on your current situation:
If you are located in Sweden a valid Swedish Personal or Organization Number is required (format: 123456-7890).
If you are located outside Sweden your ID number (Civic Registration Number, Company Number or Passport number)
Also, if you are located inside the European Union but outside Sweden your VAT ID is required.