If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?

India drift, MIT News

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If people in North India are called North Indian, and down South they are South Indians, what is the terminology to use for people in the middle parts of India, Middle Indians?

Are South Indians the original inhabitants of India? - Quora

Is it true that North Indians are pure Hindu as compared to South Indians who are mostly fake & converted? - Quora

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What is the difference between North Indian people (Delhi, Punjab etc.) and South Indian people (Karnataka, Tamil Nadu, Kerala etc)? - Quora

Are South Indians the original inhabitants of India? - Quora

Differences That A North Indian Notice When Visits South

Views on women's place in society in India

Do southern Indians feel inferior to their northern countrymen? - Quora