How To Indirectly Get To The Top Of Search Engines For normal ASCII domain names, the letters a-z, the numbers 0-9, and one special character, the hyphen or dash "-". Note that domains cannot start or end with a hyphen. For the new tested IDNs (Internationalized Domain Names), the full range of Unicode characters are available.... Similar Editorial : by Kirk Bannerman. | Source : What You Need to know About Search Engines
