Apple bought partial rights to use "lightning" trademark from Harley-Davidson
Harley-Davidson had filed to use the lightning name on motorcycle parts, protective gear including helmets, turn signals, television sets, and even eyeglasses. Apple's application shows a partial transfer of the trademark was made on Thanksgiving leading us to assume that Harley-Davidson still has the right to use the name on some of its motorcycle gear, while Apple can use it for its dock connector and for other technology products.
For the Rip Van Winkles out there, the lightning dock connector was released by Apple this year, starting with the Apple iPhone 5, and replaces the old 30 pin connector. Apple does sell an adapter to convert from 30 pins to the 8 used with lightning, and there is also an Apple-sold adapter that goes from lighting to USB.
source: PatentlyApple via Gizmodo