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If $A=\left[\begin{array}{cccc}1 & 0 & 0 & 0 \\ 2 & 3 & 0 & 0 \\ 4 & 5 & 6 & 0 \\ 7 & 8 & 9 & 10\end{array}\right]$, then $A$ is
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A lower triangular matrix
Since a square matrix $A$ whose elements $a_{i j}=0$ for $i \lt j$. Then $A$ is the lower triangular matrix.
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