A line of Symmetry.
If the two halves are identical then the line is a line of symmetry and is also a bisector.
line of symmetry
A wye switch is a railroad switch of a Y shape, in which one line splits into two which diverge at equal angles.
Every line bisector divides a line into two halves: by definition!
diameter
If the two halves are identical then the line is a line of symmetry and is also a bisector.
The Equator is the primary one, but any line of longitude will split the Earth into two equal halves.
a diameter for a circle possibly a bisector for other shapes
An eclipse has one symmetrical line, which is the line of symmetry that divides the shape into two equal halves.
line of symmetry
Bilateral symmetry divides an organism into left and right halves.
A wye switch is a railroad switch of a Y shape, in which one line splits into two which diverge at equal angles.
A line of symmetry divides a figure into two matching halves.
Every line bisector divides a line into two halves: by definition!
That line is called a "Diameter".
equator
The Equator...