it's the equator.
the equator
The equator is another name for the 0 line of latitude.
The definition of zero latitude, from which all others are measured, is the equator.
'Lines' of latitude are often called 'parallels' of latitude.
The name for the line of latitude is the Equator (the most important line of latitude).Others include:North PoleSouth PoleArctic CircleAntarctic Circle
Linesof latitude are also known as circles of latitude or parallels.
meridian
parallel
equator
o degrees
longitude
Equator.