Bitsquatting refers to registering a domain name one bit different from the target domain name. The intent is that a memory error will cause someone to get the bitsquatted site instead of the legitimate one.

"During the logging period there were a total of 52,317 bitsquat requests from 12,949 unique IP addresses. When not counting 3 events that caused extraordinary amounts of traffic, an average of 59 unique IPs per day made HTTP requests to my 32 bitsquat domains."

http://dinaburg.org/bitsquatting.html

Overheating can be a cause of bit errors, and heat is a concern in mobile devices and laptops.