Why is it called the equity ratio and not the debt-to-equity ratio?

The equity ratio is the ratio of total liabilities to total owners’ equity. This indicator reflects the relative relationship between capital provided by creditors and capital provided by shareholders. It also refers to a joint-stock enterprise. The ratio of the total shareholders' equity to the total assets of the enterprise is an indicator for evaluating the rationality of the capital structure.

This "property" refers to "capital provided by creditors" and also refers to "total assets", which is a relative concept.