The rightmost part of an Internet address is called its zone. Name zones are divided into two categories: the three letter zone and the two letter zone. Three letter zones are set up by type of organizations;. Com stands for commercial;. Edu stands for educational institutions;. Gov represents government bodies and departments. Within the United States, most Internet sites have names in one of the three letter zones; elsewhere, it is more common to use geographic names, by country or other recognized political entity.