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DOF（degree of free） 自由度
"Degrees Of Freedom" or "DOF" is a number of axis and sensors combined for balancing a plane, a helicopter or a robot.
3DOF : 可以是3轴的加速度计或者是3轴的陀螺仪。
This could be a 3-axis accelerometer or it could be a 3-axis gyroscope.
6DOF : 基本上是3轴的加速度计和3轴的陀螺仪结合。
This is mostly a 3-axis accelerometer combined with a 3-axis gyroscope.
也可以是3轴的加速度计和磁力计结合。
An other example of 6DOF is a combination of an accelerometer and a magnetometer for a tilt-compensated compass.
9DOF : 在6DOF上加上磁力计。
This is mostly a 6DOF, combined with a magnetometer (compass).
10DOF : 在9DOF上加上压力传感器。
This could be a 9DOF, combined with a baromic pressure sensor.
The baromic (or absolute pressure) sensor can be used as an indication for the height.
11DOF : 在10DOF上加上GPS模块。
This could be the 10DOF, combined with a GPS module.
具体地址http://playground.arduino.cc/Main/WhatIsDegreesOfFreedom6DOF9DOF10DOF11DOF