What was the name given combined ot all the states of india of low economy(unofficially)?

BIMARU is an acronym coined in the 1990s referring to the economically lagging states of Bihar, Madhya Pradesh, Rajasthan, and Uttar Pradesh. The term comes from the Hindi word 'bimaru' meaning 'sick' and was used to describe these states' poor performance in health, education, and infrastructure indicators. Rajasthan has since made significant economic progress and is often excluded from the category in contemporary discussions, while the term remains controversial for its stereotypical generalization.