In the case of a cuboid it makes little difference. In other cases, vertical, because many maths books refer to one of the non-rectangular sides as the "base" and a base should be at the bottom.
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If the vertical and horizontal stripes are in the same window, then CONGRATS! if its a horizontal stripe in the first window and the vertical stripe in the control window, then you are not pregnant.
Vertical is up and down and horizontal is side to side. Think of the horizon, it is a line and horizontal has the same root. In fact, one definition of horizontal is parallel to or in the plane of the horizon.
Easy! You put the two horizontal one above the other on the left side and the vertical one on the right side. (Technically you can do either side.)
The y-axis is vertical and the x-axis is horizontal.
one is horizontal an the other is vertical