polar coordinates

/P OW1 L ER0 K OW0 AO0 R D AH0 N AH0 T S/
noun
  1. 1

    The coordinates of a point in a plane, measured as its Cartesian distance from the origin and the angle measured anticlockwise/counterclockwise from the x-axis to a line joining the point to the origin.

  2. 2

    The coordinates of a point in three-dimensional space, measured as its Cartesian distance from the origin, the angle measured from the z-axis to a line joining the point to the origin, and the angle measured anticlockwise from the x-axis to this line.

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Source: https://en.wiktionary.org/wiki/polar%20coordinates