The term nanotechnology conjures up something very small in size to be measured in the range of nanometers. It is the engineering of functional systems at the molecular scale, according to popular definitions given by experts in the field.
When the technology became popular two decades ago the aim was to build machines as small as possible or just a few nanometers wide. Scientists and engineers wanted to make motors, robot arms and even computers on a molecular scale. This was considered to be weird and only later did the technology gain some acceptance.