A line on a weather map that connects places where the temperature is the same is called an isotherm.
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A line through many points with the same air temperatureis an "isotherm".The "isobar" is a line through many points with the same air pressure.
The croquet start line is called a baulk line.
It is called the "ordinate" axis.
The middle of a line segment is called a Midpoint.;-)
A line.