An asymptote.
It is called the origin, or the point (0, 0).
There is no such thing as exactly vertical because either it is vertical or it is not. You cannot have approximately vertical - it is not vertical, then. Vertical means at 90 degrees to the horizon (or horizontal).
I think {grid or grid lines} is the term you're looking for.
The x-axis in coordinate geometry is the horizontal axis and the y-axis is the vertical axis.
That is the correct spelling of "vertices", the plural of the term vertex.
the term for the ratio of vertical change over horizontal change is slope
Vertical
The term vertical refers to up and down.
vertical
0
Vertical is a relative term. It usually refers to a direction pointing in the opposite direction of Gravity. So if you are in outer space, then I guess there is no real "vertical" direction.
Trust
Trust
Horizon is not right, its vertical!
PARALLELISM
Vertical columns are known as groups.