\begin{definition}[Definition:Pascal's Triangle/Column]
Consider Pascal's Triangle:
{{:Definition:Pascal's Triangle}}
Each of the vertical lines of numbers headed by a given $\dbinom n m$ is known as the '''$m$th column''' of Pascal's triangle.
Hence the leftmost '''column''', containing all $1$s, is identified as the '''zeroth column''', or '''column $0$'''.
\end{definition}