毫伏 (háo fú) is a unit of electrical potential equal to one-thousandth of a volt (0.001 V). It combines the prefix 毫 (háo), meaning 'one thousandth' — commonly used in metric measurements like 毫米 (millimeter) and 毫升 (milliliter) — with 伏 (fú), the Chinese abbreviation for 伏特 (fútè), the transliteration of 'volt'. This term appears frequently in scientific, medical, and engineering contexts where small voltage differences matter, such as measuring brainwave activity (EEG), heart signals (ECG), or sensor outputs.

In everyday usage, 毫伏 is rarely encountered outside technical settings; native speakers typically only use it when discussing electronics, biomedical instrumentation, or physics education. It’s always written without spaces and never pluralized — Chinese units don’t inflect for number. While 毫 and 伏 individually appear in other compounds, their combination specifically denotes this precise SI-derived unit, not a general description of 'small voltage'.