An 
matrix
![[a_(11); a_(21); |; a_(m1)].](/https/mathworld.wolfram.com/images/equations/ColumnVector/NumberedEquation1.svg) |
Column Vector
See also
Matrix, Row Vector, VectorExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Column Vector." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ColumnVector.html