Not any sort of cable I've ever seen, could it be some kind of proprietary cable from a printer or some kind of camera or something?
It appears that one of those is a USB, but it might just be the photograph?
Could that be a printer cable?
Yeah it does resemble a USB cable. It reminds me of a firewire cable. If it's a printer cable, I wonder what it would be used for, seeing as both sides are identical. It would have to plug into two of the same devices... Printer-to-printer sync cable!
One end is a usb device end. The others look like fire-wire ends. So, my guess is that it is a usb+fire-wire cable, capable of making a fire-wire to fire-wire device, or fire-wire to usb device connection. It definitely does not look like a USB to fire-wire cable, on the other hand. IE, it should work to connect an Apple system to a USB device (printer, drive, etc), or Apple to other fire-wire device.
Yeah that would make sense. Hmm now to find a use for it.