https://en.wikipedia.org/wiki/Roundness_(object) Roundness Roundness is the measure of how closely the shape of an object approaches that of a mathematically perfect circle. Roundness applies in two dimensions, such as the cross sectional circles along a cylindrical object such as a shaft or a cylindrical roller for a bearing. In geometric dimensioning and tolerancing, control of a cylinder can also include its fidelity to the longitudinal axis, yielding cylindricity. The analogue of roundness in three dimensions (that is, for spheres) is sphericity. Added to support Critical Zone Observatory (CZO) data use cases. Wikipedia ODM2 Working Group A vocabulary for describing the name of Variables. ODM2 Variable Name Controlled Vocabulary