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.

My friend keeps reptiles.

There are many caterpillars in the garden.

There are many worms in the garden.

This larva takes several weeks to become an adult.

Trematodes are a type of parasite that live inside humans and animals.

There are a lot of insect galls in the garden.

This tree has a lot of galls.