The shape of an individual filament when cut at right angles to its axis.Normal shapes for manufactured fibers vary, e.g., round (nylon, polyester, polypropylene, andsome acrylics), serrated or crenular (viscose rayon, acetate, and triacetate),bean-shaped (some acrylics and modacrylics). The shaped of manufacturedfibers can be modified by changing the shape of the holes in the spinneret.Cross-sectional variants are produced intentionally in wide variety of shapesfor different physical effects such as change in luster or hand, improvedresistance to soiling, etc. Examples are trilobal (T and Y) and other multilobalshapes (cruciform, K, X, pentalobal, star, etc.), I-beam, ribbon, square,triangular, elliptical, hollow, and many others.