Latin alphabet is 26, Greek alphabet is 24, pronunciation is their respective latex form, capital letter is its lowercase latex initial capitalized form, such as（

Δ

When Western mathematicians deduce mathematical theorems, they still use Greek letters which are not easy to write and remember. This shows the great influence of the Renaissance and Greek mathematics on later generations. Pay attention to the distinction

Δ

(pronounced Delta for increment) and

∇

(it’s pronounced nabla, which means differential. It doesn’t belong to the Greek alphabet. It’s just a sign for differential operator.)