\muThe Greek letter mu (\mu) is commonly used in mathematics, physics, and engineering to represent various concepts such as the coefficient of friction, the mean of a probability distribution, or the magnetic permeability of a material.
Mean of a set of values in statistics
\mu = \frac{1}{n} \sum_{i=1}^{n} x_iFormula for frictional force where \mu is the coefficient of friction
F = \mu NMagnetic field relationship where \mu is the magnetic permeability
B = \mu H