# Notation for random vectors

Random variables are usually denoted with upper-case letters. For example, there could be a random variable $X$. Now, because vectors are usually denoted with a bold lower-case letter (e.g. $\mathbf{z} = (z_0, \dots, z_{n})^{\mathsf{T}}$ and matrices with a bold upper-case letter (e.g. $\mathbf{Y}$), how should I denote a vector of random variables? I think $\mathbf{x} = (X_0, \dots, X_n)^\mathsf{T}$ looks a bit odd. On the other hand if I see $\mathbf{X}$ I would first think it is a matrix. What is the usual way to do this? Of course, I think it would be best to state my notation somewhere in the beginning of paper.