Like other early Chu rulers, Ruo'ao held the hereditary noble rank of viscount that was first granted to his ancestor, also named Xiong Yi (熊繹, different in Chinese characters), by King Cheng of Zhou.
Ruthenium oxide (RuO2) shows some of the best performance as an OER material in acidic environments.
Ruo, Micronesia, a village and municipality in the state of Chuuk