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In terms of a headset, such as the kind used for virtual reality, rotational envelopes can also be thought of in the following terms:
![three degrees of separation three degrees of separation](https://static.wikia.nocookie.net/meerkats/images/f/f0/Three_degrees_of_separation.jpg)
The data is made relevant through software that integrates the data based on the needs and programming of the users. Measurement of the six degrees of freedom is accomplished today through both AC and DC magnetic or electromagnetic fields in sensors that transmit positional and angular data to a processing unit. The term is important in mechanical systems, especially biomechanical systems, for analyzing and measuring properties of these types of systems that need to account for all six degrees of freedom. Humanoid robots typically have 30 or more degrees of freedom, with six degrees of freedom per arm, five or six in each leg, and several more in torso and neck. In 2007, Dean Kamen, inventor of the Segway, unveiled a prototype robotic arm with 14 degrees of freedom for DARPA. This is a practical metric, in contrast to the abstract definition of degrees of freedom which measures the aggregate positioning capability of a system. Robot arms are described by their degrees of freedom.
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This provides a direct relationship between actuator positions and the configuration of the manipulator defined by its forward and inverse kinematics.
THREE DEGREES OF SEPARATION SERIAL
Serial and parallel manipulator systems are generally designed to position an end-effector with six degrees of freedom, consisting of three in translation and three in orientation.