One characteristic of India is a number of consonants pronounced with the tongue in the roof of the mouth - a t, a d, an s and an n. (They also have what we consider the standard versions of t, d, s, and n.) They are called "cerebral" consonants if I remember aright. When Sanskrit (at least) is transcribed into English, those cerebral consonants are written with a dot underneath. My Sanskrit teacher guessed that they came into Sanskrit from the Dravidian languages.

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