That's a "meridian" of constant longitude. There are an infinite number of them.
A line that runs from the north pole to the south pole is called a line of longitude.
The imaginary line that runs north and south from the North Pole to the South Pole at 0 degrees longitude is called the Prime Meridian.
the equator
The imaginary line that connects the North Pole to the South Pole at the surface of the planet is called the Earth's axis. It is an imaginary line around which the Earth rotates.
That refers to the imaginary line, from the north pole to the south pole, around which Earth rotates.That refers to the imaginary line, from the north pole to the south pole, around which Earth rotates.That refers to the imaginary line, from the north pole to the south pole, around which Earth rotates.That refers to the imaginary line, from the north pole to the south pole, around which Earth rotates.
Earth's Axis
it is the line that runs from north to south throught the north pole and the south pole
longitude
The International Date Line or axis
The 0 line of latitude is called the Equator and is located equidistant from the North Pole and the South Pole.
A meridian, or a line of longitude.
There are two: the International Date Line -- 180 degrees, and the Prime Meridian -- 0 degrees.