Overview
The Greek Alphabet and Sigma are two distinct concepts, with the Greek Alphabet being a set of letters used to write the Greek language, similar to how the Latin Alphabet is used in English, as seen in the works of authors like Homer and Aristotle, while Sigma is the 18th letter of the Greek Alphabet, often used in mathematics and science, as popularized by mathematicians like Euclid and Archimedes, and more recently, by online platforms like Khan Academy and Coursera.