The equator and the lines of longitude.
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The term that indicates imaginary parallel lines that circle the Earth is "latitude." Latitude lines run horizontally around the globe, measuring the distance north or south of the Equator. These lines are used in geographic coordinate systems to help locate positions on the Earth's surface.
On the earth (and planetary/stellar bodies) they are called latitudes and longitudes.
Latitude lines are imaginary lines that are parallel to the equator to fix a position on earth (along with longitude lines which are imaginary lines perpendicular to the equator)
normal lines or normals
A circle has an unlimited number of lines of symmetry. These lines are called the diameter. Why does a circle have an unlimited number of lines of symmetry? It's because a circle has a constant diameter regardless of where the diameter is measured from.