The term "1 × 10^-9" represents a measurement in the metric system known as a "nano." It indicates one billionth of a unit, such as a meter, liter, or gram. For example, a nanometer is one billionth of a meter, which is often used to measure things at the atomic or molecular level, such as the size of DNA or viruses. Nanotechnology is a field that utilizes materials and devices at the nanoscale, typically between 1 and 100 nanometers. This technology has applications in various areas, including electronics, medicine, and materials science, enabling advancements like nanoparticles for drug delivery and nanoelectronics for faster computing.