Terminal velocity and inicial velocity they are

Well the only relation they have is that they are both velocities.

The initial velocity of an object is the velocity it begins moving with. i. e if a ball is thrown its initial velocity is the velocity it has once it leaves the hand.

Terminal velocity is the maximum velocity an object can achieve when it is in free fall. i.e if a bowling ball is dropped from a plane, its velocity will increase until it reaches terminal velocity.

It seems like your sentence was not completed, but I think you were wondering what it is called when there is a broken line passing through two points. It would be a graphed inequality, and if the inequality has a greater than symbol ( > ), the right side of the graph would be shaded in, and if the inequality has a less than symbol ( < ), the left side of the graph would be shaded in. Inequalities with greater than or equal to and less than or equal to symbols have solid lines going through two points with no sides shaded.