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.

It's difficult to find a list of commonly used kanji.

He is learning martial arts at Shaolin Temple.

Coniferous forests can remain green even in winter.

This forest tree has been alive for over 100 years.

I am planning to go to Linyi next week.

I have been to Berlin.

I am planning to travel to Guilin next week.

My dictionary is an indispensable tool for my daily learning.