This is an example of the graphic representation of a Column in a drawing.
Dimensions all vertical and horizontal columns. Columns are dimensioned as anchors, which means they are only dimensioned when they are in close proximity to a group of dimensioned objects. If a column is not close enough to a group of dimensioned objects in a particular quadrant, it is not dimensioned. Also, if the column is inline with another column that is already dimensioned, it is not dimensioned.
In the example below, notice how the top left column is not dimensioned because the bottom left column is dimensioned. Also, the middle columns are not dimensioned because they line up with the outer columns.
The left portion of this drawing has been cropped due to size constraints.