An equator
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A horizontal mirror plane though the the middle line of the E
The line with two arrows and two dots in the middle is called a "segment." In geometry, a segment is a part of a line that is bounded by two distinct endpoints. The two dots in the middle represent these endpoints, while the arrows indicate that the segment extends infinitely in both directions beyond the dots.
If you had a circle and you halved it, exactly in the middle, then that line would be a line of symmetry! And it is the same with a square. If you halve it exactly in the middle then that would be called a line of symmetry! And then all the lines of symmetry in a square are down, across, diagonal from the left and then diagonal from the right! But in a circle there are LOTS of lines of symmetry!
A location on a line is often called a point, or a place on the line.
The line that crosses the y-axis is called the intercept.