The name of the line that has 0 longitude is the prime meridian
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It is the "Prime Meridian" or the "0 degree Meridian" which is the basis for calculating time in most of the world.
The prime meridian is the longitude (vertical) line that measures 0 degrees.
a line
Zero longitude is the prime meridian. Zero latitude is the Equator.
Any line of longitude (or of latitude, for that matter), that crosses the United States, will divide it in two.