Definition:Pascal's Triangle/Column

Definition
Consider 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 $0$.

Also see

 * Definition:Row of Pascal's Triangle
 * Definition:Diagonal of Pascal's Triangle
 * Definition:Lesser Diagonal of Pascal's Triangle