It is called just that: a "point". Unless you are referring to some special point such as the midpoint or the endpoint...
Line Segment
A line with a point at both ends is called a Segment.
It is a horizontal line segment.
Probably three:The point is not on the segment nor the corresponding line,The point is in the line segment,The point is not in the line segment as given but would be if the segment were extended.
A line segment with a finite, non-zero gradient.
. . . is the segment perpendicular to the line.
divide the line segment in half to aquire the center point
A ray
A point or a line segment can be a preimage of itself because a line can be reflected or rotated.
A line segment is a line hat starts at one point and ends at another literal point.
Bisect a segment is to divide the line segment into 2
The middle point of a line segment.