There is standardized iconography[0][1]. It's enforced under trademark law by the USB Implementers Forum. In addition to the old "basic" (USB 1.0/1.1), "hi-spee

There is standardized iconography[0][1]. It's enforced under trademark law by the USB Implementers Forum. In addition to the old "basic" (USB 1.0/1.1), "hi-speed" (USB 2.0), and "on the go" icons there's now "superspeed" (USB 3.0), "superspeed+" (USB 3.1), and icons for the power delivery spec. The new icons are just as inscrutable as the old ones, but they exist and the USB Implementers Forum requires correct labeling for all cables and devices. The various proprietary extensions might be less consistent with labeling, but at least every Thunderbolt-compatible cable I've seen has a little lightning bolt icon in addition to the standard USB ones. [0]: http://www.usb.org/developers/logo_license/Trademark_License_Agreement_Licensed_Mark_Requirements_062017.pdf http://www.usb.org/developers/logo_license/Trademark_License... [1]: http://www.usb.org/developers/logo_license/USB-IF_Logo_Usage_Guidelines_FINAL_071317.pdf http://www.usb.org/developers/logo_license/USB-IF_Logo_Usage...