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An accelerometer is a device that measures proper acceleration; proper acceleration is not the same as coordinate acceleration (rate of change of velocity).
Because an accelerometer senses movement and gravity, it can also sense the angle at which it is being held. This is what makes the Wii work: Instead of a joystick, the user or player manipulates a controller (rather like a remote control). The controller contains solid-state accelerometers, which can sense the tilt, movement and speed being applied to them, as well as the direction in relation to the Wii's screen.