The Greek Symbols. Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities. There are 24 Greek letters. The Russian Alphabets There are 33 letters in the modern Russian alphabet. 10 of them are vowels (а, е, ё, и, о, у, ы, э, ю, я), 21 are consonants and 2 signs (hard and soft) that are not pronounced. Hope, this article is helpful for you.   Don't forget to subscribe my blog to more such information. Thank You. 🙏