Skewness

The skewness $S k e w [𝑋]$ of a real random variable $𝑋 : 𝜉 \to ℝ$ is the third standardized moment, prob i.e.

S k e w [𝑋] = 𝔼 [(𝑋 - 𝜇 𝜎) 3]

Standardization has the advantages of the skewness being dimensionless.