Intel uses the letters to indicate the type of connection between the CPU and motherboard. So LGA = Land Grid Array [1]. The number is the number of pins&#x2F;contacts connecting the CPU to the motherboard. So LGA1155 is a Land Grid Array Socket with 1,155 pins.<p>It&#x27;s definitely not random, at least not with Intel. ARM is confusing as hell though. Part of the issue is that there is the ARM Instruction Set Architecture (ISA) that has different versions, and then there are different ARM CPU architectures, but those two don&#x27;t necessarily need to correspond.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Land_grid_array" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Land_grid_array</a>