Question: what do the usb symbols mean?
Answer: Hardware device and port symbols ‌ A circle connected by a line to another circle, triangle and square is the symbol used to represent a USB port (USB 2.0 and lower) or a USB device. ‌ A USB symbol with two capital letter "S," a 3, or lightning bolts in front of it is a symbol used to indicate a USB 3.0 port.