S-curve, angle, angularity, angularness, bend, bending, bow, bowing, conflexure, crease, creasing, crimp, crookedness, deflection, deflexure, diffraction, diffusion, dispersion, distortion, dog-ear, double, doubling, duplicature, flection, flex, flounce, fold, frill, gather, geanticline, geosyncline, hairpin turn, hookedness, inflection, lapel, lappet, meander, orthogonality, oxbow, plica, plication, plicature, ply, rectangularity, reflection, refraction, right-angledness, right-angularity, ruche, ruching, ruffle, scatter, skewness, sweep, torsion, tuck, turn, turning