The term 'SMALL' can be broken down into two prefixes: nano and micro. Nano is a prefix derived from the Greek word for 'DWARF' and is used to denote something that is very SMALL, usually one billionth of a meter or smaller. Micro is also derived from the Greek word for 'SMALL' and is used to denote something that is one millionth of a meter or smaller. Both nano and micro are commonly used in scientific measurements and are often used to describe the size of particles, cells, and other microscopic objects.