Aditionaly, in statistics Greek letters denote parameters, while the modern Latin alphabet we all use today is for variables. The data `x` has a normal(mu, Sigm

Aditionaly, in statistics Greek letters denote parameters, while the modern Latin alphabet we all use today is for variables. The data `x` has a normal(mu, Sigma) distribution, for example. These sorts of conventions enhance readability by providing extra information. You know instantly that `y` must be data, while `theta` is a parameter.