Inertial Measurement Unit

An inertial measurement unit (IMU) is an electronic device that measures and reports a body's specific force, angular rate, and sometimes the magnetic field surrounding the body, using a combination of accelerometers and gyroscopes, sometimes also magnetometers.

A MEMS module which measures angular velocity and linear acceleration using an accelerometer triad and an angular rate sensor triad. Other IMU sensors may include magnetometers and pressure sensors.