nothing
The 50 yard line.
The middle of a line segment is called a Midpoint.;-)
i think it means middle line backer
College football kicks off at the 35-yard line.
That line is called the line of scrimmage.
the legar line
In American and Canadian Football, a ball can be passed forward from behind the line of scrimmage. If the ball falls on the ground it is called an incomplete pass. That means no one caught it. It can also be called an incomplete. That is a short way of saying "It is an incomplete forward pass."
The Horizon line
the line that goes through the middle of a leaf is called a vein.
The imaginary horizontal line that goes around the middle of the earth is called the equator.
An equator
Equator :)