U.S.B stands for Universal Serial Bus.
This is a common way to plug in different hardware in your laptop, computer or gaming system. For exaple my mouse is plugged in using this wire. --------------------->
A USB wire.
Something people get wrong is which way up it goes into the PC. On some most wires the symbole is on top ( so you plug it in sybole side up) but the bigget indicater is the chip on both the wire end and the input. In this picture its the wite bit on the bottom, you have to incert the wire so the chip is on the bottom if the inputs chip is on the top or vise a versa.