gender gap index
A statistical measure of gender-based disparities, often used in international comparisons such as the Global Gender Gap Report.
The gender gap index published by the World Economic Forum indicates the degree of gender equality in each country.
男女平等 refers to the general concept of gender equality, while 男女格差指数 is a specific quantitative index measuring the gap.
Compound of 男女 (danjo, 'men and women'), 格差 (kakusa, 'gap, disparity'), and 指数 (shisū, 'index').