The symbol "μ" (micro) represents a metric prefix that denotes a factor of one millionth, or 10^-6. It is commonly used in scientific measurements to express very small quantities, such as in the fields of physics, chemistry, and engineering. For example, a micrometer (μm) is one millionth of a meter, often used to measure tiny distances. In addition to its use in measurements, "μ" is also found in various scientific contexts, such as in the representation of the coefficient of friction or the permeability of materials. Understanding the micro scale is essential for fields like nanotechnology and biotechnology, where precise measurements are crucial for research and development.