Waviness n. : The quality or state of being wavy.

Example:
What causes the Waviness/curliness in my hair?

Taxonomy
surface waviness, measurement, parameters, free encyclopedia, spacing, variations, low band, signal, roughness, measure, roughness measurement, surface texture, peaks, high band, revolution, Oberg, Harsha, rotor.

Defination from the web:
waviness. ... Within this length the waviness profile is determined. ... Yhland, E. M. (1967), "Waviness measurement—an instrument for quality control in rolling bearing industry", Proceedings of the Institution of ...