The millivolt ampere (mVA) is a unit of measurement for apparent power in electrical systems, quantifying the product of voltage and current in a circuit when expressed in millivolts (mV) and amperes (A), respectively. Specifically, it measures the combination of electrical voltage and current that a device or system draws or supplies, taking into account both the real and reactive components. The symbol for millivolt ampere is mVA. While the volt-ampere (VA) is more commonly used for similar measurements, the millivolt ampere is particularly useful in applications requiring more precise handling of lower voltage and current levels, such as in electronics and telecommunications. In practical and scientific contexts, accurately measuring power in mVA is essential for designing and analyzing low-power circuits, ensuring efficient operation, and preventing overloads, thus playing a critical role in the development and maintenance of modern electrical and electronic systems.