However, little has been written about an interesting and growing subspecies of cybersquatter: the typosquatter. Instead of registering domain names containing the trademarks of others, these folks take a lower-risk course of action. They look around and see which Web sites get the heaviest traffic. Then they register, for themselves, domain names that consist of the likeliest typographical errors that users are may make when seeking to access these sites. Domain names like "amazom.com," "dismey.com" and so on.
Source: wiktionary