Definition: The word "010603" refers to the International System of Units, which defines the number system used by all countries around the world. This number system includes everything from meters (m) to seconds (s). It uses prefixes such as micro and nano to represent smaller quantities. For example, one micrometer is a measurement that measures 10^(-6) of a meter, while one nanometer is a measurement that measures 10^(-9) of a meter. The number "010603" could be used by people in various fields to keep track of measurements or calculations.