Zero

You can get an m×n matrix of all zeroes, for any m and n.

$\blacktriangleright$ Matrices + Fill Matrix + Zero

$\left(\vphantom{
\begin{array}{cc}
0 & 0 \\
0 & 0
\end{array}
}\right.$$\begin{array}{cc}
0 & 0 \\
0 & 0
\end{array}$$\left.\vphantom{
\begin{array}{cc}
0 & 0 \\
0 & 0
\end{array}
}\right)$