\chiThe Greek letter Chi (\chi) is often used in mathematics and science to represent a variable, a characteristic function, or a distribution in statistics. It is a versatile symbol that can be applied in various contexts, such as in algebra, calculus, and probability theory.
Chi-squared distribution, commonly used in statistics for hypothesis testing.
\chi^2Characteristic function of a set A, used in set theory and probability.
\chi(A)Integral involving the chi function, used in calculus.
\int \chi(x) \, dx