µµF

Translingual

Symbol

µµF

1. (metrology, dated) Symbol for the micromicrofarad, an SI unit of electrical capacitance equal to 10⁻¹² farads (now known as the picofarad, symbol pF).
   • 1948, Nathan Marchand, “Frequency-Modulation Receivers”, in Frequency modulation; fundamentals, apparatus, servicing (in English), New York, Toronto: Murray Hill Books, Inc., page 276:

     The de-emphasis network, consisting of a 220,000-ohm resistor and a 560-µµf capacitor in the output of the discriminator, provides the necessary amount of de-emphasis.

Usage notes

• The SI unit system no longer permits compound prefixes.