⏺. The Greek Alphabet has been used to write since late ninth or early eighth centuries. Earlier, the Greek alphabet was consist of only 22 letters. By the end of the fourth century, "Alpha" and "Omega" were added as new letters to the greek alphabet. So, today's greek alphabet is consist of 24 letters.

⏺. Its better to know the whole greek alphabet. Take a look at the following table.
It shows the capital and simple greek letters with it's english equivalent.

⏺. In our day-to-day life we use greek letters for different purposes. Mainly greek letters represent constants in mathematics and science.
Other than these sometimes greek letters are used as standard variables in mathematics. Some examples are mentioned below.

⏺. Other than these there are lots of other uses of greek alphabet. Click on this to get more information about greek alphabet.