This iteration mark is a symbol used to omit the repetition of the same kanji.

He is learning how to write kanji using Kanji return.

This wall is painted with red lead.

She is an expert in special needs education.

I will make orecchiette pasta tonight.

He is a pessimist, always looking at the bad side of the world.

In this situation, it's inevitable that he resigns.

He had no choice but to quit his job.

In this situation, he has no choice but to act.

Unable to bear the pain, he had no choice but to scream.