8

8 is the set number for four LEGO sets. It could refer to any one of the following:
8-1.jpg|8 Universal Building Set
8-Basic Set.jpg|8 Basic Set
8-Replacement 4.5V Motor.jpg|8 Replacement 4.5V Motor
8-Magnetic Train Couplers with Plates.jpg|8 Magnetic Train Couplers with Plates