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In electromagnetic wave propagation, polarization such that the tip of the electric field vector describes a helix. Note 1: The magnitude of the electric field vector is constant. (188) Note 2: The projection of the tip of the electric field vector upon any fixed plane intersecting, and normal to, the direction of propagation, describes a circle. Note 3: A circularly polarized wave may be resolved into two linearly polarized waves in phase quadrature with their planes of polarization at right angles to each other. Note 4: Circular polarization may be referred to as "right-hand" or "left-hand," depending on whether the helix describes the thread of a right-hand or left-hand screw, respectively.