1. The brain and central nervous system.
2. The administrators, operaters, and programmers in a computer network.
3. Sometimes used in science fiction to define computer hardware that has been integrated into the brain.
a base-10 measuremnt system that the whole world uses except USA, who should adopt it
The USA's standard system has 12 inches(in) to the foot(ft), and 3ft to the yard(yd) whereas the metric system is 10 milimeters(mm) to the centimeter(cm), 100cm to the meter(m), and 1000m to the kilometer(km).