They may look like indentations or ridges in the nail plate. The ModuLiq Zero Indentation Style groups with carriage returns rather than indentations. Whole cross-sections of walrus tusks are generally oval with widely spaced indentations. The coins' edges have regular indentations. Resistance to abrasion is less affected by surface variations than other methods of indentations. They manufactured rough pottery, mostly without decorations, or ornamented by making fingernail indentations. These long interdunal indentations that are framed by Pleistocene longitudinal dunes, charactise the present landscape. Knobs, indentations and dovetails were used to form joints between stones. The indentations caused by the elements can concentrate stresses and generate cracks at the components. The operation is performed for producing indentations on a part of a workpiece. Japanese buildings may sometimes have L-shaped indentations at the northeast to ward against oni. This headdress is distinguished by a high crown and deep indentations on all four sides. The Latin name is "fossae lumbales laterales" ("lateral lumbar indentations"). Pieces are often manufactured with indentations to aid stacking. The name refers to the shape of the indentations left by that process (called "cubing").