None, because a line goes on forever. A line can only have points.
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well, a line consists of an infinite number of points the three important points on a line are start (the origin of the line) end (the end of the line) midpoint (halfway across the line)
A line segment is a straight line with end points
a line with two end points
line segment
If you mean a straight line that does not extend BEYOND it's two end points, then that would be a 'line segment.'