what is the handwritten notation for a random vector?

Question

Not sure if this is a maths question but didn't know where to turn. I'm learning probability theory on my own using a textbook. It uses capital letters with subscripted number to denote random variables (eg, X1,...,Xn) and bold subscripted capital letters (eg, X1,...,Xn) for random vectors. What's the convention for representing the latter in handwritten notes? thanks in advance,

Answer 1

I teach in my physics class that vectors are shown in textbooks by boldface but are shown in handwriting by adding the vector symbol over the variable. So,

$$\mathbf {X_n}=\overrightarrow {X_n}$$