Nanotechnology draws its name from the prefix "nano". A nanometer is one-billionth of a
meter—a distance equal to two to twenty atoms (depending on what type of atom) laid down
next to each other. Nanotechnology refers to manipulating the structure of matter on a
length scale of some small number of nanometers, interpreted by different people at
different times as meaning anything from 0.1 nm (controlling the arrangement of
individual atoms) to 100 nm or more (anything smaller than microtechnology).
https://www.sharda.ac.in/course/m-tech-in-nanotechnology-98

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