Is there a good notation for stacking matrices into a tensor?

Question

Let $v_1, v_2 \in \mathbb{R}^n$ be two vectors,

then a matrix with these vectors as columns is usually denoted as $M = [v_1|v_2]$

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Now suppose I have matrices $M_1, M_2 \in \mathbb{R}^{m \times n}$

I want to represent the 3D tensor which is by stacking these matrices

Is $T = [M_1 | M_2]$ a good way of representation this tensor? Or is there some other way of representing this "embedding"?