The east hemisphere starts along the line called the Greenwich Meridian. This line is the 0 degree line for latitude.
That line is called the line of scrimmage.
No, it starts on the international date line
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The croquet start line is called a baulk line.
a feature of ms word that automatically starts a new line when it reaches the end of the line.
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....it starts on the floor
it starts after the person serves which is on the base line
This song is called "World" and it's by Five for Fighting.
In the context of basic geometry, a line that starts at a specific point and goes off indefinitely is called a "ray" (as opposed to a line or a line segment).
In general they are called the beginning and the end. In a race they are called the starting line and the finish line. In real estate they are both called the property line. In geography they are both called the town line, the city line, the county line, the state line.