Polar coordinate system

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English: In a polar coordinate system, a point is refered to by numbers including at least one distance r and one angle θ.

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  Circular coordinates in the plane (r,θ)
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  Spherical coordinates (r,θ,φ)
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  Cylindral coordinates (r,θ,h)
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  To represent the orientation of an object in space, three angles must be used. This can be viewed as a generalization of the spherical coordinates: ρ is not of interest, but an additional angle ω must be defined; however, this is not the standard way to define an orientation, one uses instead the Euler angles
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