Dimensional metrology is the science of measuring the size, shape and other geometric characteristics of objects. There are several synonyms of this term used in different fields of science and technology. In mechanical engineering, the term "mechanical metrology" is used to refer to this practice. In the field of optics, it is known as "optical metrology." Similarly, "geometric metrology" is used to describe the measurement and analysis of geometrical features of objects. "Precision metrology" is another term used to describe the accurate measurement of various parameters of an object. In short, dimensional metrology is an essential field of study used in several scientific and industrial processes, characterized by precise and careful measurement techniques.