What is the prefix meaning one one millionth (1/1,000,000)?

The prefix that signifies one millionth, or 1/1,000,000, is "micro." In the metric system, "micro" is represented by the symbol "μ," which comes from the Greek letter mu. This prefix is commonly used in various scientific and engineering contexts to denote very small quantities, such as in measurements of length (micrometers), mass (micrograms), and other units where such small scales are significant.

For instance, when discussing electric currents, microamperes (µA) are often used to measure very low currents that are crucial in certain applications. Understanding this prefix is essential for interpreters of electrical terminology, ensuring accurate communication of measurements and specifications in the field.

Milli, which represents one thousandth (1/1,000), and nano, which signifies one billionth (1/1,000,000,000), are different and cater to larger or smaller scales, respectively. The prefix "sub" is not a standardized metric prefix and doesn't fit within the established system of metric measurement. Thus, the designation of "micro" to indicate one millionth is aligned with the international standards for metric prefixes.