Sounds like the connectors on your motherboard to attach the wires that power USB and PS/2 ports. USB is universal serial bus and its the common way for information to travel in and out of your computer. PS/2 is the previous generation of mouse and keyboard ports. If I'm right about what your talking about the connections arent on the PSU, there on either the front or back panel of your computer case. So the power wires run from your motherboard to those connections on the case so you can hook up a USB or PS/2 device.