Nanometer is the billionth part of meter. If the precision is more than 100 nm, then we can consider that we deal with nanotechnology. The thickness of a hair is 30 µm/30 000 nm. One may imagine the complexity of operations carried out with 100 nm precision. At that the field of application of nanotechnology does not matter since nanotechnology is the “horizontal” technology that can be used in diverse fields of science and industry.