The equator (zero latitude) is the only one.
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Arctic Circle.
The line of zero latitude, also known as the "equator", is.It's roughly 24,800 miles long.
Yes,and it is included from the lines of latitude:tropic of cancer,equator,tropic of capricorn & antarctic circle
In geometry it is called the "Great Circle".
Any such line is called a great circle. There are infinitely many of them.