The phrase you provided refers to a very small unit of electric voltage: a millivolt (mV). A millivolt is one thousandth of a volt. Context and details

• Basic unit: volt (V) is the SI unit of electric potential, voltage, and electromotive force. One volt equals one joule per coulomb, or equals one watt per ampere. The millivolt is 1/1000 of a volt.

• Common prefixes: “milli-” denotes a factor of 10^-3, so mV = 0.001 V. This is widely used in electronics for small signal voltages.

• Practical use: millivolts appear in sensing circuits, analog signals, and measurement instrumentation where voltages are small.

If you’d like, I can translate the terms or provide examples of how millivolts are measured in typical circuits.