Where Hindi is spoken.
Hindi is one of the official languages in India.
Appearances in The Big Bang Languange
Raj is fluent in Hindi, thus it seems to be one of his mother tongues.
- In The Vengeance Formulation (S3E09), hearing that Raj speaks a long Hindi phrase "Fever 104, बहुत अच्छा संगीत के मौजूदा घर" (pronounced as "aajke naye acchha sanjeetka ghar"), which he explains as "Fever 104, home of the really good current music", and says "it's much catchier in Hindi".
- In The Psychic Vortex (S3E12), Raj speaks a Hindi phrase "जो जी करे कर" (whatever floats your boat) when he find that Sheldon is learning Finnish.