Farad

the unit in which CAPACITANCE is measured. It is usually denoted by the symbol F. For example, the capacitance (C) of a conductor measured in farads is the charge (in coulombs) needed to raise the potential by one volt i.e. 1 farad = 1 coulomb per volt (1F = 1 CV^-1). As the farad itself is usually too large a quantity for most applications, the practical unit is the microfarad (µF), or one millionth of a farad.

Taken from Dictionary of Science

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The farad (symbol: F) is the SI unit of capacitance. The term farad is named after the English physicist Michael Faraday.

A farad is the charge in coulombs a capacitor will accept for the potential across it to change 1 volt. A coulomb is 1 ampere second. Example: A 47 mA current causes the voltage across a capacitor to increase 1 volt per second. It therefore has a capacitance of 47 mF. It has the base SI representation of s⁴·A²·m^-2·kg^-1. Further equalities follow:

The most commonly used multiples and submultiples in electrical and electronic usage are the microfarad, nanofarad and picofarad.

Taken from Wikipedia

Factorial

the multiplication of a series of consecutive numbers from I to n inclusive, where n is a whole number. Thus, factorial 5, written as 5! = 1 x 2 x 3 x 4 x 5 = 120. Factorials of much larger numbers are not usually defined.

Taken from Dictionary of Science

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In mathematics, the factorial of a positive integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example,

and

The notation n! was introduced by Christian Kramp in 1808.

The factorial function can also be defined for non-integer values, which involves more advanced mathematics, especially mathematical analysis.

Taken from Wikipedia