# Interpretation of a Wiener process definition

people.

So, I have studying an article about modeling a noise in my study field (Telecomunications) and I have found a mathematical notation that I never had found before.

$$\overrightarrow W(t) \sim N(\vec 0, tI)$$

followed by the expression:

$$\overrightarrow W(t) = [W_1,...,W_n]^T$$

in the article, the author explicitates that $$n = 12$$, but not especificate $$I$$. I don't know if this $$I$$ is part of notation of a Wiener process or something else. In really, I don't know how to interpretate the notation of the Wiener process, in a first moment, i have thinked that's was a simple normal distribuction, but in my research on web, I'd realize that's more complicated.

So, thanks.