The origin
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The horizontal line on the coordinate plane is the x axis and is usually in the form of a number line that meets the vertical y axis number line perpendicularly at the point of origin which is at (0, 0)
The Cartesian plane consist of an horizontal x axis number line and a vertical y axis number line and both axes are perpendicular to each other intersecting at the point of origin which is at (0, 0) or at their respective number lines which is zero.
An infinite number of lines can pass through a point.
In linear perspective there is a horizon line and a vanishing point to which all non horizontal lines lead to. There are also vertical lines. Proportion lines are simply a starting point for an artist to determine the correct proportions of the portrait or picture.
It is called the origin, or the point (0, 0).