In mathematics, a matrix (plural matrices) is a rectangular array or table of numbers, symbols, or expressions, arranged in rows and columns, which is used to represent a mathematical object or a property of such an object.
For example,
\[\begin{bmatrix}1&9&-13\\20&5&-6\end{bmatrix}\]
is a matrix with two rows and three columns. This is often referred to as a “two by three matrix”, a “2×3-matrix”, or a matrix of dimension 2×3.
Bibliography
“Matrix (Mathematics).” 2022. Wikipedia, August. https://en.wikipedia.org/w/index.php?title=Matrix_(mathematics)&oldid=1104306314.