LGA 775, also known as Socket T, is an Intel desktop CPU socket. LGA stands for land grid array. Unlike earlier common CPU sockets, such as its predecessor Socket 478, the LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on the underside of the processor (CPU).
Read more about LGA 775: Technical Specifications, Improvements in Heat Dissipation, LGA 775 Mechanical Load Limits