Question

The word Delta is originated from the
Greek at alphabet​

Answer 1

The delta letter in Greek alphabet actually is the first letter of the word for difference in Greek language, which is  diaphorá. In math, delta symbol is also used to define discriminants in polynomial equations, the area of triangles and macroscopic changes as well as several other things.

Answer 2

Explanation:

Greek Alphabet are different from english alphabet , so we cannot say which alphabet is used in place of delta.

Well, Greek alphabet are :