Between two points
Parallel is a term that is usually used to describe the direction of a line. Parallel runs in the direction of north and south.
Ray - A ray is part of a line that has one endpoint. It continues in one direction without ending.
It is the direction in line with (parallel to) the axis of the part. If you have a cylindrical shaft, for example, the axial direction runs along the length thru the center of the circular ends.
It runs in a north south direction
a straight line
A horizontal ray in math is a line that runs horizontally that has one starting point and goes on forever in the opposite direction.
one direction
A north-south line is a line or direction that runs from the north to the south, or vice versa, on a map or globe. It is used in navigation to indicate orientations relative to the North and South Poles.
The imaginary line around which a planet spins is called its axis. It is an invisible line that runs from the planet's north pole to its south pole and determines the direction of rotation.
The line in a line of Longitude and it runs north and south.
we all know, a line segment is a portion of line with two fixed points A and B , but this segment has no specific direction i. e AB and BA are both line segments but if we give direction to this line segment suppose from A to B, then it becomes directed line segment, which is also called as vector AB having direction from A to B.so, a line segment with specific direction is called directed(having direction) line segment.
These are line segments that are the same in direction and length. * * * * * They need not be in the same direction.