A part alternation mark is used in these lyrics.

This equation has a singularity.

The main problem with this project is the lack of communication.

He scored an own goal during the match.

On the day of the equinox, the length of day and night becomes almost equal.

This sentence is emphasized using side dots.

I got a failing grade in math.

He got a failing grade on the math test.

There are many points in common in our hobbies.

Their ideas have many points in common.