"々" is an informal substitute symbol for Chinese characters. In fact, it is a cursive variant of "Tong". The interpretation of Shuowen is the same, and it also meets. Taoist books in Zhengzitong also have the same characters. "Lutong Poetry" is not different, but different, which means big and small. There is also a saying from two horizontal changes.
Used as a repetitive word, used as a reduplication.