An additional reason why people may not be confident in their initial alignment - Even if a user knows about the icon indicating "top" of a USB plug, and is aw

An additional reason why people may not be confident in their initial alignment - Even if a user knows about the icon indicating "top" of a USB plug, and is aware of the top side when plugging in a plug, there's no such affordance for the socket. The top side of the socket _should_ be on top, but the socket might be rotated 90 degrees, and might be on the backside of the device, requiring _correctly_ rotating your mental model of the socket just to know which way the plug goes in!