What shape is described as an elongated curvature with parallel C-lines?

The shape described as an elongated curvature with parallel C-lines is the oblong shape. Oblong is characterized by its length being greater than its width, resembling a stretched or elongated form. The presence of parallel C-lines indicates a smooth, continuous curvature, typical of an oblong shape rather than more symmetrical forms such as a square or round shape, which are defined by equal dimensions and proportions. An oval also suggests a smooth, curved form but does not imply the same extent of elongation that defines an oblong shape. Thus, the correct identification of this feature as an oblong shape aligns with its characteristics in both dimension and curvature.