Why is $Y e^{i\omega t}$ called an "elementary process"

Question

In my seminar, we encountered the process:

$X_t = Y e^{i\omega t}$, $t\in \mathbb R$, $Y$ centered complex random variable with $E|Y|^2 = \sigma < \infty$, $\omega \in \mathbb R$ is a constant

and the supporting materials called this process an elementary process.

Why is this so? In what sense is the process elementary?

Thank you.