what does it mean if the HDI of a country is 0?

A Human Development Index (HDI) value of 0 in a country would suggest that the country has the lowest possible level of human development. HDI is a composite index that measures three dimensions of human development: a long and healthy life (life expectancy), access to knowledge (education), and a decent standard of living (income).

A HDI of 0 would indicate that the country has extremely low life expectancy, limited access to education, and a very low income level. It would suggest that the country lacks basic social and economic development and faces significant challenges in terms of poverty, health, education, and overall well-being of its population.

Countries with an HDI of 0 would typically be the least developed and face significant social, economic, and political issues that hinder their progress and human development.